The most important part, location. It's a great location. It's close to all the places to eat and drink that you probably researched on various blogs. The location is what I would equate to the Lower East Side of Manhattan New York. It's very popular, but still has some "edge" to it. So my advice to anyone is: Be city smart.
Secondly, Salvador was very responsive to inquiries/messages and was available for contact during our stay. He greeted me when I got there, and he provided some good intel regarding the area. He also introduced me to Constantine, the super, who you'll interact with often during your stay.
The apartment overall was good. If you're looking for a clean, relatively modern place to stay, Salvador's home will do the job. If you're expecting a super cozy, authentic lived-in feel, you probably won't get that here. It's minimal, clean and practical.