Hi I’m heading over in October and would love to to an overnight stay on an island too. Hopefully someone answers soon!
I suggest staying in phi phi at least three full days. It’s extre gorgeous there and deserves more than a day trip. Lots of people stay near Tonsai.
We stayed at phi phi cabana. It was excellent for us. About a 2 min walk from the pier and 5-10 minute walk to the bars.