Our stay in the apartment was generally really good. Antonio was a great host while we were there - very friendly, helpful and polite - and he even helped me out after we left Cala Ferrera when I misplaced my wallet. The location is very good - just a 5 minutes walk from a really nice beach. Cala Ferrera is touristy but less so than other places. The apartment was clean and comfortable and everything worked as it should have.
The only minor issue with the apartment for us was the unexpected noise outside. We had an apartment overlooking the main road, so I would recommend asking for one overlooking the pool or similar. Buses and trucks drive along the road next to the apartments and stop with their engines running for several minutes or even longer. There is also a Karaoke bar close by which makes lots of noise on some nights. Ear plugs help a lot at night and during the early morning. During the day it made our terrace a much less relaxing place than it would otherwise have been.