Had a great stay at Oscar's apartment. We stayed for one month whilst waiting to move into our own apartment. The apartment space is perfect for two people, one bedroom with a living room and small kitchen area. Basic amenities in the kitchen were catered for including a coffee machine, cutlery, pots and pans (but no kettle). Good heating system if it gets too cold, but we hardly ever used it.
The friendly cleaner came once a week and done a thorough clean. The guards at the compound gate are always friendly and buzzed you in no matter what time of day or night. The gym was great, although as it's winter the pool was not open.
Plenty of shops, restaurants and Farmacias within a five minute walk. Madrid South Bus Station is a ten minute walk, Atocha Train Station is 30 mins, Metro is 10 mins, also a nice park a few minutes walk.
Oscar was always very responsive when I messaged him. All in a all a great stay and would thoroughly recommend.