Esther's apartment was clean and in a great location. It's almost across the street from Parque de El Retiro which I highly recommend visiting and we were also able to walk almost anywhere else we went within roughly 20 minutes. So the location of this apartment is fantastic for Madrid.
Communication with the host was prompt and easy. Guests should be aware the bathroom you have access to is not attached to the bedroom you stay in - not a bad thing but just something to be aware of.
Overall, staying here made our stay in Madrid very fulfilling and Esther was nice enough to let my sister, who lives in Madrid, to come visit with us in the apartment.