Kalliopi's place is perfect when you are focusing on climbing and not planning to spend too much time indoors. The place is cosy, like going to your grandparents for your summer holidays. The location is close to all shops and restaurants (and harbour to Telendos), but can be a bit noicy from early morning due to traffic.
You have the basic kitchen equipment to prep for breakfast or pasta in the evening, perhaps don't expect to find some fancy kitchen gadgets and tools. Internet connection is pretty good and can handle as well video meetings (if required).
Antoni and Kalliopi are super friendly and nice hosts. They will take excellent care of you with small treats like cookies or delicasis from the local cuisine. They are also very forthcoming, as they allowed us to stay as some hours after the check-out time. I think they offered to us the best welcoming I have experienced in an Airbnb.