The location is excellent - just minutes from Retiro Park, lots of excellent restaurants and cafes, bakeries and grocery stores. The Metro stop is right out front, but we walked everywhere because we like to walk in cities and the apartment is close enough to do so.
The apartment is beautifully furnished and feels elegant and homey at the same time.
This is a great place to stay if you want to get a feel for what it might be like to live in Madrid...it is in a lovely neighborhood that is full of residents, not tourists.