The stay at Olga's apartment was amazing!
First of all, the place is very central with access to everything (park, public transportation, restaurants, bars, etc.).
The apartment is big, very clean and had everything we needed.
The view is on the back side of the building which is very silent, so we could sleep with the windows open. (There is AC in the room, but we prefer to not use it if we can help it)
Olga was very nice as host, she had the perfect mix between being non-intrusive and giving good recommendations and advice.
Overall we had a very nice stay, and we're thinking about coming back when we can plan a longer vacation in this very nice city.