We loved staying in quiet Varenna for a week. There are enough local shops open late to get vital provisions as well as plenty of bars and restaurants within easy walking distance for eating out. We bought a 6 day ferry pass, as we had decided not to hire a car. Frequent ferry connections criss-cross the lake, so you can visit other more busy lakeside towns and of course the famous villas. In Varenna there are interesting walks, if you don't fancy leaving the area for the day.
Flower's house is in the centre of Varenna and was fine for our needs. We had a spectacular view of the lake from one of the windows. You can hear traffic on the narrow cobbled street below, but that didn't keep us awake. The kitchen had enough facilities to prepare hot meals, but we only used it for breakfasts and snacks. When we arrived, there were a couple of niggling faults, which were quickly fixed after I contacted the agent.