I had to check in this hotel due to missing my connection flight out of Heathrow. The 1st thing I hated was the long walk through the tunnel from Heathrow to the hotel. It was a fifteen minute walk with very cold windy weather and luggage. but once out of the tunnel the long walk was worth it, it's a 5 star hotel with excellent decor and beautiful lobby and bar/lounge are behind the reception. The check-in was quite quick even though I had no reservations but given the layout of the hotel the room was far away from the lobby reception area. But once in the room or even the hotel, you hear no planes at all as if your in the city. The room size is very nice with all amenities and coffee/tea makings, but no window to open given the hotel location.
The staff are friendly and helpful. I would stay there again if I had an over night at Heathrow.