The location of the apartment is great: it is right in the heart of the Old Town, so you get all the perks of staying in a medieval atmosphere. Really cool! The guestroom with a window on a chapel is beautiful.
Buying groceries: Mercado Central de Atarazanas is just 200 m away, Carrefour Express is 150 m away, everything is well in this regard. Lots of restaurants and cafes nearby.
The kitchen is OK and will do the job if you do not cook too actively. The bedroom's ventilation may seem limited for some people: there is a window opening into a tiny inner yard, but the air there is quite stale, so you might want to use the aircon. At the time of our stay the shower needed some improvement, I am sure the host will take care of this.
Overall a nice apartment for a couple of nights.