I was a little worried about collecting keys from the airport but it worked well. The central location was great with a very secure entrance through outer doors and a courtyard but the actual apartment was above a bar/restaurant that closed past midnight every night. Whilst this did not bother us after such tiring days it might not be ideal for those with young children or light sleepers.
The apartment looked newly decorated and felt clean and minimalist which made it feel more like a hotel than a home but it was comfortable and serviceable. The photos did not show the 2nd bedroom at all - it was a nice room so better photos would have helped.
I did miss the personal contact as we never actually met our host however we had speedy responses to any questions via email.
I would definitely recommend this apartment to others - a great base for exploring Madrid and a comfortable haven to return to each evening.