My husband, daughters, and I stayed at this property at the end of November, 2005 for 1 night on a layover at Heathrow Airport. While the hotel is by no means a dump, I personally would not stay here again as I feel it does not live up to the expectations I have for a Marriott property.
The hotel is a rather large hotel that reminded me of a large Holiday Inn or Days Inn. Check-in was very smooth with no problems. The room itself, however, was disappointing. We arrived at the hotel around 3:30 in the afternoon imagining that we would relax in the room before our flight the next morning at 8:00 a.m. (We were finishing a 10-day trip to Italy.) The room, however, was small and dingy. While it was clean, the decor is very 70's, the room had an old feeling to it, and the accommodations were very tight. The bathroom was very small and had the old feeling to it as well.
Room service was extremely limited and quite pricey for selections that were not that appealing. However, even if the room service had offered tastier choices, we would still have fled the hotel room because it was just too depressing to sit in there for an entire evening. Luckily, there is a large shopping mall and cinema that was not too far away (7 pound cab fare to Queensmere), and we were able to escape.
As for location and proximity to Heathrow, this hotel is NOT close to Heathrow. Although it is serviced by an airport bus, it is not the best choice for those looking for convenient airport lodging. First, from the airport, the Hotel Hoppa bus took quite some time to come to the airport stop (I assume due to the time it takes to make the circuit to the property and back.) We waited at least 1/2 hour in freezing weather for the shuttle to arrive at the pick-up stop. On return to the airport the next morning, the shuttle was right on time for departure; however, with the morning traffic, it took us almost 45 minutes to get to the terminal from the hotel! (We have often stayed at the Paddington Hilton upstairs from the Heathrow Express station in London. It was much faster to get to Heathrow from London on the Heathrow Express than it was to get to the airport from this Marriott. This was just the reality of the traffic situation.)
With that said, if you are on a budget, the Marriott Windsor may work for you. It was not horrible, it just was not particularly pleasant. On a positive note, the staff of hotel were nice, friendly, and effecient. Also, the cost of this hotel was about 40% less than the sister property closer to the Airport. However, this hotel does prove the adage that you get what you pay for; the choice is up to you.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.