Mario was an excellent host. I had to change the dates of my stay at the last minute and he was very accommodating. He lives and studies very close by and can come by very quickly to help out. I was being a dum**** using the wrong key to lock the apartment and he was there in 5 mins. The apartment is close to Portazgo metro, a 15-20 minute ride to the centre of Madrid (12 mins from Atocha, 18 mins from Sol). The flat faces a big square/park which is a nice place to chill and hang out. Highly recmmended!