Sergio was a great host and very responsive. He provided a lot of good tips and recommendation. He made sure that we had everything we needed for our stay. His place was only 5 mins walk from SOL station, but very quite at night so you can enjoy a good night sleep. You can also walk to everywhere in Madrid from his place. It is very convenient. The apartment itself is very nice, clean, and very spacious. I would recommend Sergio's place to anyone who wants to visit Madrid.