Carmelo's apartment is perfect place to stay for a short stay in Madrid. Great location, right at the heart of Malasaña, which is full of great places to go for Tapas. Metro station is a few minutes away and you can easily walk to main tourist attractions in the city centre.
The apartment is nice and has all you need. Carmelo is a great host and extremely available. The apartment is in a busy square that gets quite noisy at night in the weekend. However the apartment is in the inner court and you cannot hear anything coming from the street. Unfortunately people in an apartment next to ours were quite loud during the night and this was a little annoying.
I would recommend Carmelo's apartment to anyone, great value for the price you pay. And Madrid is definitely worth a visit!