Hi Shasha,
Hotel & Residences Il Teatro is where we stayed and we are returning there again this year. They are apartments within a hotel, great location 2 streets back from the beach, overlooking a small square with ice cream cafes on every corner, and 5 mins walk to the waterpark. The apartments are very modern and clean, and there is a pool on the ground floor as well as a rooftop jacuzzi pool and lovely loungers up there with view of the sea, heaven! Fabulous staff, so friendly and accommodating with children. We ate in the hotel restaurant a lot, it looks out onto the square, lovely food and very family friendly.
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The season is very short, take the opening days for the waterpark Aqualandia as a guide. In 2012, it's open from May 26th to Sept 9th. So travelling outside of those dates i can imagine it would be very quiet.
Let me know if you need any more info.