Carla's place is truly wonderful. The house is beautiful and the location is superb. Filicudi is fantastic. The locals that manage the house are friendly and available. We would definitely stay again.
We are active vacationers so we didn't rent a car or scooter but hiked up and down the mountain each day (40 minutes or 40 floors each way).
It was easy to communicate with Carla before we arrived but there was a bit of a hiccup on arrival due to no WIFI on arrival. Be sure to get the checkin details before you get on the ferry - unlike the hotel cars her driver isn't waiting at the dock but at the roundabout at the end of town (roughly 300 meters). Also be sure to pick up water and other necessities on arrival so you don't have to return immediately to port as there are no minimarkets nearby.