I stayed at Cristian's apartment for an extended research trip and it was perfect! It is in a good location, within walking distance to the metro station (about 5 min.) and some popular tourist attractions (the Zocalo, Palacio de Bellas Artes for example). The apartment is very quiet which is suprising. You can easily forget there are busy streets outside. It was my third time to DF, so I didn't need much help, but whenever I contacted Cristian he was very quick to reply. I would definitely stay here again!