We had stayed at the Westin Excelsior last year as well. We unfortunately only going to be there for one night. A hint of the service we were going to find, when the valet asked if we wanted to have him park it. When we asked how much parking was, he told us it was 50 euro. When we hesitated, he said, "Don't worry about it, I will find you a space." Our car was parked in a space out front the entire time for nothing more than a tip.
The service went up from there. We found champange & strawberries & a cheese tray in our upgraded suite. The suite had a breathtaking view of the river. Like a previous poster had mentioned, the balcony would have been perfect for a cocktail party.
Directions from the staff were given to a perfect dinner place and lovely breakfast the next morning.