We stayed at Domina Inn Royal in late September and thought it was a very nice hotel. The rooms were clean and quiet, however, it was quite a walk to town. There is also a bus that picks up out front and the staff can provide a schedule if you ask.
Our only complaint was the pool issue. As just about everyone has mentioned, they require a bathing cap to go in and while we didn't ask, I didn't see any advertisement of where you could get one. During our 3-day stay, we never saw anyone actually go into the pool, which is probably why it was so clean. It was a shame because if I knew you couldn't use the pool, I probably would have booked one a little closer to town without one.
If we were to stay in Positano again, we would probably pick one a little closer to the beach.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC