Teresa is a wonderful host, very nice and full of life and was super fast to answer to all my messages and we also got some welcome gifts.
The apartment is as in the pictures and it is located super near of Gran Via metro station and close to Sol as well so very convenient to go around.
The kitchen is super well equipped, lots of ustensils and all, I really enjoyed having access to those.
The downsides for me are the lack of curtains in the bedroom, Teresa tried to install something with duck tape and all but it was just very annoying to take off and put back.
The doors locks are tiring as well if you decide to come back late and didn't get the trick yet as I sometimes spent 15 minutes trying to open them at first.
It's a very nice apartment but I wouldn't recommend for more than a week because the street is extremely loud and stays like that until 2am and that gets very exhausting after a while. The streets around here are also constantly crowded which gets fustrating if you are more than a tourist and stay for a while.
I do feel like I should precise that the Calle Montera is a whore street, you'll see them everyday at all times and at late at night they can get very insisting towards boys. I didn't find it impossible to live with as the street is very touristical but it can be uncomfortable.
To sum up, I recommend for a weekend trip but not for longer than that.