We stayed at Hotel Don Felipe for one night in August. It was a nice hotel, comfortable enough for our short stay. They had a small pool with a beautiful view, which was nice to swim in to escape the heat. The hotel was also about 20 minutes from the Aragonese Castle, which was the main reason we came to Ischia. It's a bit far from the port but you can take the bus if you don't want to walk.
The quality of service was okay but not the best I've encountered while traveling. At check in, they asked for our passports and when I got to the room, I realized that they never gave it back to me, like most hotels did. When I went back to ask for it, the staff disappeared into the back room for 10 minutes before coming back and giving us our passports back. There were other people waiting for their ID's as well, after asking for them several times. Their actions made us just a little nervous because it almost seemed like they couldn't find our personal documents, but it turned out fine thankfully.
The room itself was okay, nothing fancy. The sheets were pretty rough and not very comfortable. The breakfast was good, and they had some cute cats.