Neat little apartment! The location is extremely central -- I didn't even need to use the Metro for my 2-day exploration of Madrid. The apartment itself is quite small and the bed is on a platform with very little headspace (i.e. ok for sleeping but not much else, if you catch my drift). The amenities were minimal. Wifi quite slow but enough to look up things to do in Madrid, etc.
Estibaliz was very responsive and flexible! She had no problem with me checking in and checking out late. Thanks Estibaliz!