Carmelo's flat is in a great location for a visit to Madrid - just off Gran Via, close to both the Malasana and Chueca barrios. Although you can walk everywhere in Madrid, it was great being so central to all of the places to see.
We arrived on a Sunday night, around 22:00, an hour later than originally planned, but Carmelo was very welcoming and understanding! He made sure we were well settled in the apartment before he left, giving some tips on where to go the next day. He let us know that we could ask about anything should we have any issues or questions (he lives next door).
The apartment itself was lovely, spacious for a couple. We didn't use the kitchen area during our short stay, but it has everything you need should you want to eat in.
Would recommend to anyone visiting Madrid, great apartment, great location, great host!