This is a lovely little place right near Plaza Mayor and Puerta del Sol, right above the tiny street of Calle Coloreros. The location is unbeatable. The apartment is very stylish and the 3 balconies are an amazing place to chill with a glass of wine or your breakfast.
We were a group of 5 adults and a toddler, and were a bit surprised at how small the apartment actually is, although they have done a great job of maximizing the space. One note: the bedrooms are laid out with 2 on the first floor and 1 loft up a set of steep stairs. It is lovely but something to keep in mind if you are traveling with children (as we were) or anyone with mobility issues.
Overall, though, a lovely place. It's run by a company so don't expect uber-personlized attention, but good customer service and a great space for maybe 4 people.