I totally recommend NEW APARTMENT PLAZA DE ESPAÑA provided by Monica and Andres. It is first of all great and friendly attitude of the hosts basing on regular and smooth communication offering help in any organizational issues related to visit in Madrid. For me who visited Madrid for the very first time it was especially important:)
Also, the location of the apartment is very convenient with short, walking distance to Plaza de Espania. Finally, the apartment looks exactly as the photos show and is equipped conviniently with all the facilities visitor would need.
Summing up - highly recommended!
Muchas gracias, Monica and Andres!:)