Ana and Pierre are excellent hosts; they were very welcoming, friendly, communicative, and answered any questions we had about the area. The place itself is in an amazing location - within the castle walls.
Some things to note: the apartment is in a very old building, which is what makes it cool, but it's also what makes it very loud. If you're a sensitive sleeper, know you'll hear everything the neighbors (upstairs and to the sides) do and you will hear all the street noises very clearly.
Also, people have said this before, but it is HILLY. If you are injured, have bad knees, etc., this might be a tough walk for you. Ubers can't go within the castle walls, and cabs can, but they can only take you so far, so either way you'll still have walking up and down hills to do.
Overall, though, the place is very charming and is in a beautiful part of the city. If you're not injured and you sleep soundly / easily through the night, this could be your spot! :-)