Location location location.
Neighborhood and the location are great. There are nices squares to start and end the day, many shops and restaurants at the doorstep. The quarter is lively and yet the apartment is quiet, so you can relax and sleep well on the good matresses. You can reach everything by foot, Metro or bus.
Alejandro was easily reachable, friendly and responded immediately when something was needed.
The apartment was reasonably clean and had basic equipment.