My fiancee' and I stayed at the Blu Aqua for two nights on New Year's weekend, and we were immediately blown away by the decor of the hotel. Check-in on Dec. 30 was smooth... I tried to upgrade to a corner balcony room, but all Naturally Cool rooms with a balcony were taken. Bummer. We were placed on the 12th floor with a Park view and we were still happy with that.
Our room was right near the elevator and it was almost like we had our own personal elevator, which was pretty cool. Our bathroom seemed to be HUGE - with both a tub and a shower.... in a configuration I have not yet seen posted here by other reviewers. We loved it.
We did not eat in the restaurant but did visit Filini Bar. We thoroughly enjoyed our cocktails both nights, which were plenty potent for the price. All of the bar staff were very friendly, engaging, and fun - especially on New Year's Eve. One thing I would change would be the bar menu. Offer a few more bar-friendly food options (and also for room service).
Parking cost way too much but that's pretty much the climate in Chicago. We often ditched taking advantage of the in-and-out privileges we were paying for and took a cab to the places around downtown we wanted to go instead of paying for more parking each time. The hotel is close to everything we we never paid more than $7 one way to get anywhere.