The apartment is awesome. It's on the first floor, so you'll be seen from the street if you don't have your blinds shut. As the temperature of our visit to Madrid was around 40, shut blinds helped us to maintain a livable temperature in the apartment, so it was a plus for us. The apartment has an air conditioner, a must in Madrid, so a huge congrats on that!
The place is in the center of Madrid, I don't think it's downtown, but it's definitely the center. So you don't need to use public transport, everything is reachable by foot.
The apartment appeared to be in a safe district. We didn't see anything dangerous while walking at night. So that's a huge advantage also.
The apartment is generally comfortable, safe, and has a proper kitchen. The shower and washing machine are also there!
In general, Jose is a wonderful host, he made us feel comfortable during our stay in Madrid, and he even greeted us with a small gift! Thanks for that, Jose!