Came here for the first time with a group of friends and the rooms were convenient for the 12 of us to stay in...well, despite the fact some had to sleep on the couch/floor.
We stayed at the THESuite, approx 750 sq ft with a separate living room and bedroom. The room can come with two queens or a king size bed - couch is not a pullout bed. There is one full bathroom (with a tub and shower) and 1/2 of a bathroom (with just a toilet).
The room was clean and the decor was nice.
The only difficulty we had was finding the damn hotel. We got confused with Mandalay Bay and THEhotel. Once you get out from the self parking lot, you should really check for the signs for THEhotel. We ended up making a round trip throughout Mandalay Bay's casino, finally making our way to THEhotel and it was noooooo good, considering the fact that we were carrying around our luggage with us.
Other than that, it was a good stay here. Only downside, as others have mentioned, the hotel is on the end of the strip, so very far from everywhere. And we came during winter time (Feb) so the pools were closed. Price is reasonable!