We spent a weekend at Gianni's place and we highly recommend it if you are about to spend a couple of days at Thessaloniki. The place is at a perfect location - walking distance to awesome bars and restaurants, and close to the center. Giannis was very responsive - from the moment we booked the flat everything (check-in instructions, contact information, etc) was communicated with great clarity - and really helpful - thumbs up for saving a parking spot for us!