The good:
Enrique has fantastic communication.
The apartment is very clean
The location is central and close to everything
The price is cheap (good for traveling on a budget)
The Bad:
The apartment is on the 2nd level on a VERY busy street. The windows don't have rolling shutters to keep out noise or light. The interior wood shutters are very pretty but don't block any sound. In one room they didn't close all they way and let light in.
The bedrooms have frosted glass doors so they don't block any light from the other part of the apartment and made sleeping difficult.
If you are coming to Madrid and plan on being out all night the noise wont be a problem for you. Its not a good fit for a family or a traveler that needs a solid nights sleep (during regular night hours).
This is my error, but I didn't notice in the pictures that there isn't a proper living room. I mention it so other travelers know and can decide if that is a necessity to them or not. The two areas where the two tables are, are tiny....the size of a coat closet, again....maybe important to some people and not to others.
This apartment was a horrible fit for us, but would work really well for others.