Nisyros Island, Greece.
Lodging is not plentiful on the island and is mostly in or around Mandraki.
The Hotel Porphiris (T.22420 31376, fax 31176), open May to end of September, though simple, is the island’s most comfortable and friendly solution providing breakfast and a pleasant sea-water swimming pool.
For atmosphere and a taste of times gone by, the Thermal Baths at Loutra have basic and inexpensive rooms (no private facilities) from mid June to end of September (T.22420 31011).
Out of season, there is very little choice: the gloomy Hotel Charitos (T.22420 31322) at least has heating.