Located in the old town, it takes around 10-15 minutes to walk to the Cathedral & Alcazar.
The host was responsive. They let us keep our luggages in the apartment earlier than the check in time (then we went for a stroll), and Juan recommended us a good restaurant nearby.
Taxis don't really reach the apartment (narrow streets & dead end). so if you're thinking of taking a taxi from the apartment (to the station/airport), use a store in a bigger street nearby (walking distance of 1-2 mins) as your pickup point.