We visited for the first week in Feb 2019.
The hotel complex is large and of interesting architecture. We had an apartment with a sea view that was spacious, clean and with a balcony that provided a sun trap, staying warm a little longer at the end of the day when things cooled. The apartment was well laid out, with a very functional kitchen area and a sitting room section as well as bedroom. The only real negative was the bed - described as queen-sized, but just 2 singles pushed together with a gap between and not even covered with a double sheet. The beds were comfy however. Maid service was not daily, but was still frequent enough.
The staff were all friendly, had good English, always helpful and willing. They made us welcome and it was appreciated.
We ate half board. Breakfast had a good range of typical foods plus a few local bits and a live chef making omelettes etc. Dinner was also good, and although the buffet could suffer a little from being prepared in bulk, the live chef station provided a freshly cooked selection that was different each night.
The pool was pleasant, not heated but not cold either, and kept clean every night using and underwater robot. We saw the gym and yoga hall etc, but did not use the facilities.
There is little to do around the hotel at night, and the rest of Costa Calma is sleepy in low season, so if you don't want to watch TV make sure you take a book or 2. The hotel car park is on the dirt area beside the hotel.