A few good and bad things about the apartment:
The apartment had all the equipment we needed. It's located in a beautiful area of Modica's old town, a very quite and relaxing place. The balcony is the apartment's best feature. Great for a couple. We didn't meet Christoph personally but he seemed nice and helpful from our few whatsapp communications. However, in the apartment we were severely bitten by something we thought to be mosquitoes at the beginning, only to find out later that it wasn't mosquitoes and whatever it was, we brought it back with us. A day after we left Modica we still had new "bites", we probably got it on our clothes/skin from something in the apartment. We were worried about it and even went to the pharmacy to ask what can be done. Eventually, the second day after we left the apartment was fine, we didn't have new bites, but needless to say how "itchy" was our stay in the apartment.
In addition, the air-conditioning is located in the living room-kitchen area and the bedroom is upstairs, which means the cool air doesn't reach up there. I woke up a few times during the night just from the heat in our bedroom.
One last thing, the internet wasn't working all the time so well. Whenever we would arrive to the apartment after being outside for a while we would need to shut down the system of the internet and wait for it to work again, but sometime that didn't work either.