Our stay at Serenity by Seaclub (the Adults only part) was great.
This place is almost like a small village inside the town. All buildings are 2 level houses which accommodate few rooms. There is plenty of green space between the houses. You have two shops (only one was open as we were there mid October), a gym, swimming pools - 2 for adults only where one of them is heated, there are different activities going on in the main part of the complex as well.
We had good and quiet stay. The rooms were tidied up every day and towels changed every 3. There were a safe, bathrobes, slippers ad other small goodies already waiting for us in our room. This was included in the adult packages.
The reception personnel were nice and not intrusive. There is 24h cover for reception.
Parking spaces next to where your room is were a great addition. We do not know how it looks like in the high season, but in October you could park literally 1 min from your room.
The room amenities are sufficient - only a cooker is missing. You get a hob, microwave, kettle, all cutlery and pans.
We would gladly come back to this hotel.