The apartment is only about 5 mins. Walk from the metro station, the area is lively, but we always felt safe. The apartment is on the 3rd floor, so plenty of stairs to climb, but I think this is the norm for apartments in Madrid.
Jorge was helpful and informative. The studio apartment is compact but absolutely fine for a visit to a city when you are out and about most of the day. You could walk easily to most places in the city, but also use the metro which is so close. A 24 hour carrefor supermarket is opposite the metro stop so ideal for basics.
We enjoyed our stay in this apartment.