I don't have recent experience, but when I stayed at the Sheraton in Warsaw quite a few times about 4 years ago it was an excellent property.
By the way, what business are you in where you can still say "don't worry about the cost"? And do you have any jobs going? We used to stay in Sheratons on business, but now we're down to well under US$100 per night as the allowance in most places (and that's working for a multinational with a turnover around $15bn).
[This message has been edited by christep (edited 12-06-2002).]