Pros:
Juan's place is in an excellent location many restaurants, bars and cultural locations are within walking distance. no matter what your ideas are in Madrid you're gonna be able to comfortably do anything. It is very spacious so it's ideal for a group of friends or a family. It has a variety of utilities and 2 bathrooms so everyone can get ready without much rush.
Cons:
The washer machine is old and there's a good chance it won't be working.
Walls are thin so you're very likely to hear your upper and side neighbors in any type of situation.
The beds have a poor support system, you'll probably wake up in a big hole in the bed since the wood is so thin it can barely hold the mattress with just one person.
Besides that for the price it met my needs and we gad a great time in Madrid. If you're on a budget this is for sure the place to take.