The apartment of Bibiana is in a strategical position for visiting Madrid. It's at walking distance from the main attractions and less than 2 minutes walking from Puerta del Sol, therefore we rarely took the public transportation. We also appreciated very much the hospitality of Bibiana and her mum, who gave us many tips and with whom we had very nice conversations.
The only criticism we can make is that the attic room is really small, you cannot stand up in it, therefore is a bit challenging to dress up or walk around. It is really only a place were you can just sleep and nothing more. Anyway, considering the price, the location and the kindness of the host it is more than an acceptable compromise!
Thank you very much and hasta luego!