Susanna's place is perfect for first time visitors since it's extremely central. You get easily to all important monuments, it's surrounded by restaurants (although you should know which ones are not tourist traps) and we never felt unsafe either. Although it's very central, the place itself is very calm, quiet and the appartment very clean. We had fresh fruits for breakfast every morning and water bottles for the day. So all in all a great experience.
Thanks to Susanna and Rita