Two of us stayed in this 8th floor apartment for a week in late March. We spent most days out and about but occasionally returned mid-day to rest and typically we were going to bed around 11pm. We did not use or look at the gym or laundry facilities. We are both tall/large people and found this unit to be overall very comfortable, although there wasn't a whole lot of room to walk in certain areas, e.g. between the foot of the bed and TV.
PROS: Location!! The views (and the rest of the unit) are exactly as pictured. You're directly across the street from Alameda Park and a short walking distance to Palacio de Bellas Artes and subway/bus stations. The swiveling TV is awesome. The closet has plenty of space and lots of extra hangers as well as a few drawers and shelves. Communication and coordination with the host was excellent, probably the best I've experienced with Airbnb.
CONS: The noise from street performers was much more noticeable than I expected from reading other reviews; keeping the windows closed doesn't make much of a difference because they are single pane. Plan to bring and use earplugs or headphones or crank up the TV if you want to listen to something other than an organ grinder playing the same few notes every day and the same 20 rock songs from a street band every evening. During our visit the room was very warm even with the windows open (although that helps a lot).