All rooms are the same size (except for bathrooms). There are 6 floors of Executive rooms which have slightly different furniture.

It is a good hotel, but I think is very over-priced.

If you can, I would suggest changing to the Conrad. It is only marginally more expensive but very much superior.

The Hilton Park Lane has 'Windows' restaurant on the top-floor (28th I think) and Trader Vic's in the basement. There is a cocktail bar which is nice but pretentious.

One word of caution - Many people turn up at the Hilton Park Lane to discover they are actually booked in the Hilton Mews (which is behind the main hotel). The Hilton Mews is very much inferior.

Overall, I wouldn't worry about the room too much. Of course there are plenty of suites, if you could swing one of them....

I hope that helps.
MF