The apartment is very well placed for visitors. It is about 30 seconds' walk from a Metro station, and fairly close to the centre of Madrid. There are shops and restaurants nearby.
The fourth bedroom adjoins the lounge and overlooks a busy street, so it can be noisy. The other 3 bedrooms don't overlook the street and don't have a noise problem.
Getting into the building and the apartment was slightly tricky. You need to install a smartphone app. and using it takes a bit of getting used to. Also, the app. is not available for users of Windows phones, so one member of our group had to rely on other members of the group for access.
We would happily use this apartment on further visits to Madrid.