Nikos' place is amazing! The location is great, about a 15 minute walk to the White Tower and everything you'd need within 10 minutes walking. Nikos has been very helpful throughout the week whenever we needed some information (travel instructions, places to park, etc.). Check-in went smoothly even though we arrived past midnight. Only thing to keep in mind is the absence of some of the kitchen utensils, but we didn't really mind as much since most of the time we went out for dinner anyway.
The place is very easy to reach by public transport (<5 minutes walking to the nearest stop)! I can definitely recommend staying here when visiting Thessaloniki, absolutely great value.