We really enjoyed our stay at Eva Maria's place. Location is a bit outside the main old town area but it is only a 15-20 minute walk to all the major points in the old city center. And the walk is the through the lovely old neighbourhood. There is supermarket quite close to the apartment which was very handy. Lots of nice restaurants and cervecerias also :)
Apartment was exactly as described and we had a comfortable stay. Highly recommended.