After many researches about where to stay in Buenos Aires I decided by Ayelen's apartment. The location is very good. Near to the subway station, many buses and markets. Was very cheap to visit the best spots in town.
The apartment is very well maintained, beautiful and charming. Just like in the pictures. The building also include a good roof with gym, barbecue and hot tubs. And on the basement has a very cheap laundry for those that will stay for many days.
Ayelen is a very nice, patient and helpful person. Also her brother, Lau, who was there in our check-in. If you want tips ins Buenos Aires they can help you with a lot of good things.
So, I strong recommend Ayelen and her apartment for everyone who is going to Buenos Aires!