We stayed at Sirenetta for one night before going to the airport for an early flight. We missed breakfast since we left before 7 am. We stayed on October, which is after the season. The hotel and the area around was pretty empty. The hotel was clean, but the area outside the property had a lot of trash.
The room was nice, with a Samsung smart TV. There are no channels in English, no CNN, BBC, or Fox, etc. Only programs in Italian. WiFi worked well.
There is a nice pool with tables and chairs. The hotel charges 3 euro pp per day for beach towels.
There is a restaurant in the hotel, and few restaurants outside within walking distance.