Was in London for the weekend and went over to check it out heres the dope:

1) its a 5 star hotel that is owned by Marriott Intl(the Marble Arch is privately owned).

2) its a Cat 6 for rewards, M.A. is a 4 star and Cat 7 for rewards(major difference, less rooms than MA and less meeting rooms.

3) its on the corner of Park Lane and Oxford St(although the main entrance is off Park Lane on a street thats parralel to Oxford)

4) it looks like it does in the pic on the website except there are 2 buildings the 2nd is next to it but not facing ParkLane. Its an old bank building like the Ren is.

5) a standard room I was told is about the same size as the ones at M.A. and was told that they have about 20+ of them and that one should go for the Exec king if room size is important or higher. The best rooms will be those facing the park with high ceilings etc.

6) opening was pushed back from 11/4 to 11/18 but it will be opened on 11/18. the outside stores arent ready yet as they were still working on the lobby but was told that the rooms are ALL completed.

7) as for location cant be beat. if you go out what looked like an entrance on ParkLane then you'll be just a few feet from the Marble Arch tube station, or go around the corner onto Oxford and catch all the major buses. also a short 2 block walk to Marks & Spencers and Selfidges not to say everything else.

8) also most rooms will be king beds

all in all I just found my Marriott for London, especially sice its a Cat 6 and not 7. I was to stay at the Ren last week but changed it after I saw it back in Sept. I just the location etc of the ParkLane prop over the Ren and even CountyHall because of its location,location,location