We really liked this apartment and its location.
The apartment is a very good size for two people,and it has a sofa in the living room that can pull out to make another double bed so it wouldn't be a problem for 3 or 4 people to stay here. The apartment is clean, bright and well furnished. It also has good air conditioning in the living room and bedroom, and high speed wifi throughout. The kitchen is small but well-equipped. It has a washing machine too, which is a real bonus if you are travelling light. Above all though, the roof terrace is fabulous. It's a private space that catches the sun all day long.
The apartment is located about 5-10 minutes easy walk from all the places you'd want to see (Plaza de la Merced, Picasso Museum, shopping areas etc). There are literally dozens of restaurants and eating places a few minutes away, with choice for everyone. If you're vegan, vegetarian or plant-based, there is a "bio" (organic) supermarket just down the road and several really good vegan restaurants very close by.
There is a well-stocked supermarket directly across the road with everything you might need if you're self-catering, and lots of other smaller supermarkets and corner shops on the streets around the apartment.
Christian is an excellent host, he speaks great English too! He met us when we arrived, he showed us round the apartment and explained everything we needed to know. He was available if we needed anything and we would recommend him and his apartment to everyone.