Bonny was very accommodating, we were able to luckily check in at 2p because we arrived early in Madrid.
The Apartment is clean and in the city center. You can totally walk around and visit different areas.. Its more practical walking than taking the buses.
Pubs and restaurants are all over the place so you wouldn't get hungry or bored.. Just have a quick browse with tripadvisor for food recommendation and places to visit if you're just spontaneously visiting Madrid..
If you want to shower at late night, warm water is unfortunately unavailable.. but if you like showering cold, then it wouldn't be a problem..
Overall: my friends and I had a good time.. :)