Self check in and check out is definitely very comfortable option. Air conditioning in the hot days was essential during our stay. Very centric location. I stayed for 1 week with my kids (8 and 10 years) and we had many tourists walks from there to Plaza Mayor, Puerta del Sol, Park el Retiro and Royal Palace amongst others.
I highly recommend the transport from and to the airport by metro.
Great communication with the host. Recommened :)