Uniquely bad crowne plaza
I would have given it a poorer rating but they comped my stay. 
When checking in the first 2 room keys didn't work, ( it's no fun dragging luggage to 11th floor, almost end of hall) then in the third room there was someone in the room. They finally gave me a tiny handicapped room with a double bed where the key actually worked but there were no towels. I used the bath mat to dry myself after my shower.
They moved me for my second (and last) night to an OK room. That afternoon I had a hotel employee walk in the room once when I was in the bathroom and TWICE more later in the afternoon. In short 3 DIFFERENT TIMES in one 8 hour period.
If you want a Crowne Plaza take the one in West Houston, it's a fine hotel. The one on 59S (now called River Oaks) used to be a Holiday Inn Express and really it still is, just a different name and new paint. And not even a nice Holiday Inn Express.