We stayed as a group of 6 friends and overall had a really good stay. I'd definitely recommend this place for groups/families s long as you are less fussed about slightly older interiors.
Communication/check-in with Cati was easy and quick.
The pictures in the listing are accurate. The pool and outdoor area are great. The interior is a bit older (save for the bathrooms which seemed to have been updated recently), but it does the job and there's plenty of space. Some of the beds/bed-frames could probably use an update as well, but they were good enough for us. There are ceiling fans in each room, but it did get a bit warm for the hot-sleepers in our group; the rest were comfortable.
The kitchen had all the equipment we needed, but you'll most likely need to buy the basic essentials (salt/pepper/oil, etc.) and cleaning supplies (dish sponges, dishwasher tablets, etc.) unless prior guests left some.
The house is located 15-20 minute walk from the centre of Porto Cristo (where the beach + many of the restaurants are located). It's also about a 40 minute walk (less than 10 minutes in a car) from Cala Anguila, which our group thought was one of the nicest beaches we have even been to.
Bring mosquito/insect repellent with you, and make sure you have cash to pay the tourist tax when you check-in.