Lorenzo's apartment was wonderful. It's bigger than you would expect, based on the photos. I stayed for over two weeks, and it was very comfortable to spend some time. The space is really well organised so that every part is made use of. I dined in the apartment, and had relaxing time there, and it was definitely spacious enough.
The bed is very comfortable, and you'll get a good night's sleep. The air conditioning is great, and the ceiling window provides ventilation too. The living space is nice, and the projector is a great touch. The kitchen has everything you need for your stay, and the shower is excellent.
The neighbourhood (Malasaña/Chueca) is great. You're surrounded by interesting cafes, restaurants and bars, and the main tourist sites/centre of the city is just a short walk away. Even though you're in a really popular area, the apartment itself is really quiet and you don't need to worry about noise from outside.
As a host, Lorenzo was so helpful. If I had a question about Madrid or the local neighbourhood, or just some advice and tips, he responded really quickly.
If you're looking for a quiet apartment in a great spot, I can definitely recommend Lorenzo's apartment. It's brilliant.