Pedro was very accomodating during our 2 night stay. The apartment is located close to a number of metro stations and Atocha Railway station.
The wifi was sufficient and the apartment cosy and clean. Retiro park is a short walk away and the main city is very walkable - though you can also catch the metro if you wish.
I'd recommend this place for any small groups that are looking to stay in Madrid. Muchas gracias Pedro!