Family vacation, 5 persons, 2 adults, 2 teens and 1 child. We stayed 9 nights, goal was to be able to relax in Positano, and also to go around to visit Pompeii, Vesuvio, Paestum, Capri, etc...
For the relax part: Positano is great, very practical to go around BY BOAT. A nice village with lost of shopping and restaurant. You have to figure out the bus system (could never find a bus to the nearby stop - you walk down the steps to the intero line, then it's OK. Lot's of steps to go down to the city (but faster than waiting for a bus) - 30 minutes. Back up is another challenge.
The other part: going around is to avoid with a car after 9AM. Direction Sorrento is kind of OK, direction Amalfi is to be avoided (take the boat). Also, you can have a boat directly to Capri (for a family: not much of a difference to hire a private boat instead of taking the overcrowded regular lines).
All in all, a great family vacation in the spring, apartment a little far from the center, but wonderful view, and a private parking spot: a priceless luxury in Positano!