We had a great stay at Alfredo and Ricardo's place. The apartment is in an excellent central location, just a few minutes' walk from Plaza Mayor, and was clean, cosy, charmingly-decorated and entirely as described.
The hosts live in a neighbouring apartment and were friendly and easy to reach during our stay, while allowing us our privacy. Alfredo and Ricardo also provided lovely extras like city maps, tourist information leaflets, DVDs, books, shower amenities, a bottle of wine, sweets and chocolates.
We would definitely stay again next time we are in Madrid.