Marta's place is lovely it has everything you need. My husband and i stayed there for 4 nights and were very comfortable. The location is perfect for sightseeing we walked everywhere. Lots of restaurants around the area as well. Walking distance to the SMN train station. Which was handy as we had a few tours booked where the coach picks you up from the station.
If you have questions during your stay email Marta she responds very quickly and she will give you lots of suggestions on restaurants, bars and gelato places.