The Mogo is a well-known hotel on the eastern side of the island and its small, atmospheric rooms are still in reasonable nick. There are conscious style choices like rain showers and down lighting, which lift it above the many similar hotels around Longtou Lu. Staff do not speak English.
If you have heavy luggage, note that it's 1.7km from the arrival ferry terminal, though near Sanqiutian Ferry Terminal for easy departures.