We stayed almost a week at Olga's apartment and it was perfect for us.
It is very warm home with wooden floors and nice decorations.
The major bonuses for us was the private garage indoor parking which allowed us to travel outside of Madrid on daily trips.
The check-in and check-out times were flexible which is a big plus.
The apartment is 10min drive to the airport and 10min walk to the nearest metro station.
During our stay Olga was able to provide a baby cot which was a major advantage.
The communication was very quick and hospitable.
I highly recommend Olga's apartment and would definitely return if I have the chance.