Communication with Stefania was easy. The apartment is located near the green line metro. On the first day, I didn't have hot water, and it happened on 3 other days. When I told Stefania, she told me that the water should run before the hot water appear. The first time they ran for 10 minutes, and the second and third times way more than half-hour. Every time it has happened, I sent a message to Stefania and she came the same day or the day after and the hot water appeared the moment she came. Another thing is that I heard easily the neighbours (either talking or opening the faucet).