The apartment is spacious and clean, and contains essentials for cooking and longer stays. We stayed for 3 weeks, 2 couples and it was great. Located just up the hill from Massouri shops and restaurants, walking distance. There is even a drinking water spout located behind the house which was very convenient.
Popi is a great host who responds quickly to messages, welcomed us with water, juice, and some snacks to tide us over until we could get groceries, and even organized to clean the apartment halfway through our stay!
Wifi could be a little bit slow if you are planning to work remotely, but it didn't bother us. I would recommend to anyone staying in Kalymnos to stay here.