I highly recommend staying at Sergio's place. The location is 20/10. The street is very quiet and lined with trees and everything you need in one street. Just around the corner would be 2 amazing plazas: Sta Ana and Portal Angel where there are many restaurants and cafes. Very near would be Sol, Plaza Mayor, and 2 metros. The room and apartment itself is very modern, chic and functional. From the usb sockets, to the electric shutters.. little things like these help! Finally, Sergio was very responsive and understanding. I was not able to meet him but he was amazing as a host.