Stayed here while attending a conference in the hotel. Reviews made me dread staying there, but actually helped me enjoy it more than I might have, since it was not only not bad, but pretty nice in some regards. I agree with some reviews that the rooms don't seem 4 * level, although they were comfortable and not small like so many other London hotels. The comforter/sheet/pillows on the bed were very nice, but the mattress was a bit hard (not just firm) and it was not level, with one side of the bed oddly higher than the other (not sloping but with one side at a different level than the other??). Once I settled into the lower side, that was OK, but was glad I had to whole bed to myself. Staff was VERY helpful and friendly in every way, even with some special requests. Breakfast was quite good, and included (I paid about $260/night conference rate, so it should be) If you stand in the tub to shower, you have only 6 ft, and since I'm slightly under that, it was no problem, but if you're over 6 ft, you'll need to crouch a bit to shower! The room was quite warm, but after I figured out how to open the windows (they swivel) the room cooled to a comfortable level quickly. The biggest negative for me was the distance to Tube stations. It's a "10 minute" walk to several stations, but only if you walk at a very brisk pace---it must be at least a mile to the nearest station---do-able but certainly not convenient. If you're older and/or not in great shape, and it's a windy, rainy, chilly January evening, the walks to and from the Tube stations are no fun.

We stayed at this hotel on two different occasions within a week. I was very nervous after reading some of the reviews on this site. I honestly believe some floors must be remodeled and updated while others perhaps are not. We stayed on the 5th and 3rd floors and had fantastic stays! Honestly, I couldn't find anything to complain about. Nice fluffy comforters, coffee and tea in the rooms, clean bathrooms. Front desk was very helpful. We went to the bar several times asking for ice and was always assisted without issue. This hotel is a 10 minute walk from the Hammersmith and South Kensington Tube stops but there are several shops and good restaurants along the way. On our next trip to London I would definately stay here again. Don't let the negative reviews scare you off.

We booked this hotel through a Londonwebsite and got a good deal, 2 nights including breakfast plus dinner on the first night for £189.00. Excellent value compared to most other 4* hotels in the area where breakfast is always extra.
I checked the "Tripadvisor" website before we left for London and was rather worried that we had made a terrible mistake as not many of the reviews were good.
On arrival at the hotel we were welcomed by a very friendly and helpful receptionist and when we got to our room on the 6th floor we were pleasantly surprised as it was spacious, immaculately clean with a contempory decor. The bathroom was a good size although the shower above the bath was clearly designed for a small person! A very nice complimentary bottle of red wine and glasses were also on offer.
The inclusive first night dinner was very good, the restaurant was modern and nicely lit for the evening with a vast choice of food laid out buffet style for you to help yourself to. Breakfast was also served in the same restaurant and again the choice and quality of the food was superb.
Our only criticism was the room temperature which was stuck at suffocation level for the duration of our stay. This made sleeping very difficult as it was hard to breath!! We opened the window but it made little difference and also proved very noisy. When we spoke to reception about the room temperature they said it was because they have to set the thermostat for the winter and they were expecting cold weather and it had turned out to be mild for the time of year! This is all very well but i would expect a 4* hotel to be able to regulate the temperature of its rooms accordingly.
All up i would reccomend this hotel, the location is good and if you can get a deal it is well worth the trip.

This hotel secured my belief that the Hiltons run by Hilton UK are not up to the same standards as those elsewhere in the world. This was not worthy of being a 4-star hotel as one would expect all Hiltons to be.

The Hilton London Olympia was generally shabby and unimpressive all around. In the halls the paint was peeling, there was exposed wiring, grubbiness on the walls and the decor was dated.

The rooms were reasonably sized for London and kept clean, but as it is an older property, the walls and doors were uncomfortably thin. We could hear the muffled voices and television of the people in the room next door and could clearly hear the conversations of anyone outside in the hall. The hotel overlooks railroad tracks as well, so the noise from trains was not particularly pleasant either. The bed being quite hard was rather uncomfortable, and no match for the new generation of beds being rolled out by Westin, Sheraton and Sofitel. The lack of a hotel directory in the room was also disappointing and exemplified the general lack of detail in services and amenities provided by the hotel. Perhaps the one nice thing about the room were the crabtree and evelyn toiletries which were above average, but little details, like how they only provided one bar of soap seemed a bit odd. The towels, as with most of the things in the hotel were old and thin.

The service was ok... certainly the front desk staff were always polite and friendly. That said, I'm not so sure about housekeeping. On one day, we overheard a loud and indiscrete argument between two housekeepers that went on for a full 10 minutes outside our room in the hall. We also saw a vacuum cleaner left carelessley out in the middle of the hall another day. The hotel also lacked a doorman, which would be odd for a large 4-star in North America, but is not uncommon in London.

The location, as other posters put it, is not particularly advantageous either. There is a tube station close by (Kensington Olympia) but it only operates at peak hours and trains only come about once every 15 minutes, and then you have to transfer at Earl's Court. The best station to go to is High Street Kensington which is a 15 minute walk away. There are restaurants close by, but you are by no means in the thick of the London action, being out in what is technically Zone 2.

All in all, there really is absolutely NO reason for someone to choose this hotel. There are far better 4-stars that you can get for as cheap, in far more central locations. Indeed, the only reason i can think of why this hotel is still in business is that I noticed it was frequented by airline flight crews, who probably appreciated its proximity to a main road that led to Heathrow.