I stayed at Kleanthis apartment for 5 days and I highly recommend it to anyone visiting Thessaloniki.
The apartment itself was clean, good
Sized and with all the equipment you will need during your stay plus a good view of the city and sea from the balcony.
The location for me is a big plus, it’s a walking distance to the city centre and a couple of mins away from the highway.
Communication with Kleanthis was easy and fast.