The location is great. Right across the street from the botanical garden, and a short walk from Reina Sofia museum, Museo Del Prado, parque del retiro. Easy walk to metro and Atocha train station. You can also find places to eat, get groceries and a pharmacy.
Heaters in every room, and towel heaters in bathrooms.
This is a first floor unit, and the only downside was some noise from upstairs when people walked around (but nothing major).
This is a good unit for a family stay, and we would consider it again in the future.