This is a great Airbnb for 1-2 travelers. It's right off Gran Via and situated close to the interesting stores Malasaña has to offer. The host always answered all of my questions during my stay very quickly. The building is renovated, peaceful and quiet.
The only real downside of this Airbnb was lack of hot water - even though I used the shower at different times of the day, it always turned ice cold within a few minutes every time during the week.
The loft bed also may not be ideal for tall or claustrophobic travelers as it is close to the ceiling (you can hit your head if you sit all the way up). Make sure you are comfortable with the ladder - I fell my first night, but I'm also a bit clumsy. :-)
Helpful to know in advance for international travelers - you will need internet to enter the main building door. The remote lock on the apartment was not working on my first day either but the host took care of it within 24 hours. Once it was fixed entry/exit was very easy.