My girlfriend and I visited Thessaloniki for a couple of days and stayed at Stelios' apartment. It's a really clean, tidy, cozy place, offering more than we even needed, 5min walking distance from the very heart of the city. We didn't have the opportunity to meet Stelios in person but his girlfriend made sure we had everything we needed.

For what it's worth, Stelios' response to my request was extremely fast; we've practically booked the place in a couple of hours, on the same day of our trip.

Hopefully, I'll stay for a longer period of time next time.
Thank you, guys =)