This is a lovely little flat, a stone's throw from Atocha Station. it's really close to a number of metro stops, and is walking distance from park Retiro.
Madrid can be a fairly loud place, but the flat is located in a slightly quieter neighborhood. Though the are nice bars, cafés, a Lidl etc nearby (hint: head towards Delicias Station when exploring the neighborhood, some nice independents down there that don't get too busy) the access to the central part of Madrid is the main feature here. It's only a few stops up to Plaza del Sol, or a 30 minute walk if you feel ambitious.
The flat itself is clean and well presented, and it's set up very nicely for 2 people. It's not enormous but we definitely felt like we had plenty of space, even though it's essentially a studio flat! César was very accommodating with our awkward arrival/departure schedule too.
Great little place, would definitely recommend