This is a very nice and tidy hotel, located very close to where you pick up your rental car at terminal 4. We found the staff very helpful and friendly, with absolutely no problems whatsoever. The rooms were really nice and clean, comfy bed and a decent size flatscreen tv with a good choice of channels to choose from. They also have a nice selection of tea and coffee to choose from in the room. Like others have said, the rooms are very quiet and there is no noise from planes landing or from people running in the hallways.
We had breakfast in the morning, which was outstanding! What a great selection of everything from cereal and yogurt, to a proper full English breakfast with fried bread, crumpets, mushrooms, bacon, eggs and so on. The friendly staff kept it nice and clean and offered to fill our glasses up with freshly squeezed OJ, as well as tea or coffee.
The only improvements I can think of - and the reason for not giving it a 5 star rating - is that you have to pay £11 for parking which is ridiculous, and also that I cannot get over the fact that Hilton keeps charging you too much for wifi. In my opinion wifi should be included in the price. In all fairness though, I should point out that there is free wifi in the lobby so it's not all bad.

Just stayed for two nights at the Doubltree London Heathrow. It was my first stay at this hotel and it proved to be an excellent choice, if you need to stay near Heathrow.

The hotel is located in Cranford; not right at the airport but close enough to qualify as being near the airport. Although it is not in the Heathrow free ride zone, it can easily be reached by London Bus, as the bus stop is right in front of the hotel. It takes 10 minutes and Routes 105 and 111 go there from the Heathrow’s Central Bus station at terminals 1 and 3. (Cash fare is GBP 2.40 or GBP 1.40 with an Oyster card).

Alternatively, one can take the Hotel Hoppa Bus (hotel shuttle) for GBP 4.50 per person, but the cheaper and more frequent London Bus service seems to be the better choice.
Hotel rooms are modern, attractive and - typically for London - on the smaller side but by no means tiny and give enough space. My room including the bathroom was very clean. Housekeeping was definitely doing a good job. The bed was very comfortable and although close to the airport the room was absolutely quiet. The bathroom was again on the smaller side, but nice, practical and in excellent condition. Shower was also excellent : water pressure good and water temperature constant. Nothing left to be desired. The price for the room was GBP 54.-/night (including tax) which I consider a good deal for this hotel. Check in was efficient and friendly.

The only thing you have to be aware of, the there is no WIFI in the rooms, but you can connect to the internet via cable, which worked fine for me. Connection was flawless and fast. However, unless you have at least Gold Status in the Hilton Honors program, there is a steep charge for this service (GBP 12.- /24 hours). I also believe there is WIFI service in the lobby.

Breakfast was also very goood with all the choices of an English breakfast up to black pudding.#

So, really well done, Doubletree !

A great hotel...after being based in Asia for a long time, I really value the fantastic breakfast offer. It is little far from the airport - however there is a good bus service to get you there.

Local areas seemed to have a OK selection of shops (including a Tesco supermarket for forgotten items).

I will definitely use this hotel again.

We have just been to London on a New Year Theatre and Dinner Dance trip, staying here for two nights bed, breakfast and evening meal (the second meal being the dinner dance on New Year's Eve). We were two couples and had a most enjoyable time. We found the hotel delightful. It was modern, fresh and attractive.The layout was open plan. We ate in the dining area which also had the dance floor. The food was excellent, both at breakfast and in the evening. The hotel looked pretty, trimmed for Christmas. There were D.J.'s both evenings. Both were brilliant. We were really pleased with our bedrooms. The staff were delightful and nothing was too much trouble for them. I would definitely recommend this hotel. Thank you to the staff for a delightful stay.