This was my first time in Madrid, and I couldn't have asked for a better place to stay at!
The host - Alberto was the best host I've ever had. He was so friendly, very funny, extremely organized (he has lots of laminated diagram and information sheets in the apartment), and just so sweet (he left us cheese, wine, water, and chips!).
The space - Since this has the attic, it's on the sixth floor of a six-floor walkup (five floors? six?). Alberto helped me with my luggage when getting up there the first time, but my friend did say carrying his up was a bit difficult. But getting up there day-to-day is really not that bad, especially because you'll be drunk or at least somewhat buzzed from all the very affordable wine you'll be having in Madrid. You forget how many floors it is at that point! The apartment itself was SO clean, which I appreciated so much after being at other apartments before this that were not so clean. It is equipped with everything you need!
The location - It is so central that my friend and I walked past the apartment so many times without realizing it. It's a quick walk from San Miguel Market (which we basically ended up having all our meals at), the oldest restaurant in the world (make dinner reservations way in advance or just make sure you're there at 1pm when it opens for lunch), and tons of bodegas and supermarkets. It's also in the heart of La Latina so the night is filled with people leaving cava bars (you will be one of them!).
If you can't tell from this review so far, I highly recommend staying at Alberto's place! Thank you, Alberto, for everything!!