I read the reviews after I made the booking, so it was feeling that I will be stuck in a bad hotel. Once I arrived, I was greeted by a very nice gentleman on the reception who quickly checked me in and told me all I needed to know about the hotel. The room was ok, excellent hotel location, the service is excellent, clean and the staff very friendly.
The hotel is doing some renovations, so if you sleep in after 9:00 expect construction noise that would last all day. The paid internet was not 100%, some disconnections and slow speed
Overall, I had a good experience. I think once they are done fixing the hotel it will be a great place to stay at

I stayed one night... that was enough. I requested an accessible room as I was on crutches. When I saw the room I asked if they had a REFURBISHED accessible room, and was told they were being done last (thanks for that!). I then said, I'll cope stepping into a bath - just give me a refurbished room. I was then told that was the only room they had. I find that hard to believe as the hotel was not busy when I was there.

Outside my room window (when I went to investigate why the curtains were blowing in a breeze -- only to find the window wasn't actually open, just falling apart) I could see something directly outside. In the morning, when I was woken up at 7am but raucous shouting from the builders, I could see it was a skip full of old bits of the building. Then the drilling and hammering began. By 8am I was out of there to try to get some breakfast.

The breakfast at the hotel was overpriced, and frankly I wouldn't have trusted its quality or safety. So I made it around the corner to Bayswater Road where there was an emergency McDonalds.

This hotel is dire. The rooms that have not been refurbished should not be being sold. When asked how my stay was at check-out I laughed. The bed was springy (I could hear it ping) and sunk in the middle, the bathroom was from the 1980s, the whole thing needing ripped out. I asked how long it has been a DoubleTree and was told flatly "we're not yet a double tree". That's funny, cos everywhere you look there are signs saying otherwise, a hhonors check-in desk, and on the doubleteee website where I booked it based on the lovely room photos. Did someone say Trade Descriptions Act...?

I've finally had it with Hilton. I'm cutting up that hhonors card.

... that's what you would like to do as you check into your room. Contractors scaffolding literally abuts your window. However, as the window is jammed shut any friendly jesture is restricted to a wave as the builders clatter by.
You've read the other reviews and you may be wondering what's going on. The place is in the process of a significant - and necessary refurb. Cant tell you about the 'done over' rooms but can comment on the 'still to do' rooms and the fabric of the Hotel generally.
Our room was small with a big TV. The bathroom was very small - impossible to face the basin and mirror. It was also insanitary with black mould and grunge a plenty. The rooms aircon was quirky, noisy and not especially effective.
The hotel fabric overall was tired to the point of comatose. Some bits were dangerous (crumbling step to front entrance). I understand the place is presently run by a Hilton associate and due to fall into the Hilton family proper in a month or two's time.
There is a lot to like about this Hotel - it's position opposite Kensington Gardens is superb - for the Place, the Museums, for West/Central London, for Portabella Rd, for buzzy' Notting Hill Gate is one stroll away or Queensway is in the other direction. Staff are friendly and efficient - they don't deserve this substandard Hotel. Beds are comfortable. Breakfast ok. Pleasant walk to some good ethnic restaurants (see separate reviews).
But at present it aint 4 star. It aint value for money and Hilton is probably going to have to address a reputation issue on takeover and after refurbishment.

If you've stayed in a hotel in any other major city, you will find that the size of this hotel was comparable to half the size of a motel room, and for the price (£400 per night = $800) I've decided to give this hotel a 2 star rating. Thank goodness we used our points for our stay instead of direct payment.

Great location, it's near the Queensway underground with a whole block of overpriced shopping but affordable (by American standards) food - mainly Asian cuisine; it's just too bad that the hotel concierge did not tell us about convenient local spots leaving the guest guessing.

The room service for cleaning was excellent, and the beds were very comfortable. Additionally, our credit card gave us the opportunity to get inclusive breakfast in the lobby which was great (both service and food).

Conclusively, this hotel is located in a nice area so if you have money to burn then great, but otherwise, keep looking. Hotels in London are unfortunately, in general, extremely small for their price.