Very smooth and easy communication and check in/out (keybox at the entrance).
Kitchen is well equipped, so it's easy to cook.
Location is perfect. Still quiet but restaurants, Bars and supermarkets are really nearby (Eroski supermarket is just a 5min walk). Bus stop (if you're traveling without a car) is also just around the corner.
For some people (also for me) it might be a little bit unaccustomed to sleep without any window (due to the fact its a basement apartment).
All in all it was a great stay at Nieves apartment.