My Business Partner and I were in Madrid for a business trip and looked for a central and clean apartment to spend the nights. I have to say that Guillermo's place absolutely surpassed our expectations: the check-in worked out perfectly (besos a Antonio ;), everything was very clean and exactly as in the pictures, supermarkets and restaurants were very close-by. Apart from this, you can reach basically every thing in the city center within 20 minutes! To make it short: book it! ;)