We stayed at Konstantinos' place for 10 days. The location is perfect, very close to city center and all main attractions are within a short walking distance. The apartment is very spacious and has a large balcony with a nice view over the city. It's well-equipped - we found there everything what we needed for our stay. WiFi and AC worked fine. As for the host, even though we didn't meet Konstantinos in person, we spoke over the phone and he was very amicable and helpful. We would definitely recommned this place for a stay in Thessaloniki!