Situated more or less in the centre of the archipelago, and a few hours south of Turku, Nauvo is a popular supply centre. The marina is pretty sheltered, except perhaps from the north, and is easy to enter, but watch out for (buoyed) shoals to starboard. Some of the moorings are odd too, as you nose the boat into a couple of rubber straps and then winch a rope from pontoon to stern (there's nothing astern to make fast to). These are best avoided by the bigger boats.
The marina is friendly and has good facilities, there are a number of restaurants and a reasonable supermarket.