I can only recommend staying at Lucienne and Kenneth´s Apartment. Its location is ideal for swimming and also if you want to go sight seeing. Valetta is quite near and you can reach nearly every City and sight from the bus terminal there.
The apartment itself is very comfortable and inviting. Lucienne welcomed us and showed us how to work everything. There were also some nice things for breakfast already there which was really nice and made us feel at home immediately. I would definitely go there again and can only recommend booinkg this apartment.