We have enjoyed Silvia's apartment. It was clean and very confortable. The location is perfect if you want to visit the old town. Despite being in the center, it is also very quiet. The view from the apartment is also great. It is very well equipped.
The apartment has a lift, but in order to go into it you need to go through four steps of stairs. Not really a problem, but if you have reduced mobility you might want to take this into account.
For the rest, we definitely recommend Silvia's apartment.