Vagelis is super responsive, has a lot of recommendations and solutions, and is a fantastic host. I give him an A+ rating!
A few little things to be aware of about the apartment if you're at all high maintenance or someone that does not like to walk. The view is wonderful, but it is in a hilly area and it requires walking at times. I'm from San Francisco so this didn't bother me at all, but my friend from Los Angeles who is used to driving everywhere was a little challenged by this at times. There were two occasions during my 3 week stay where cabs didn't want to go up the narrow street and dropped us off towards the bottom of the hill. Granted, I think these were just cranky taxi drivers...we took a lot of taxi's and generally the drivers had no problem and were delightful. The people in general in Greece were SO friendly and helpful. Also, there is not a washing machine or microwave (this is all in the description but I just missed it), and the kitchen is a bit bare. However, our host Vagelis was fantastic about helping me find a laundry which was inexpensive and saved me having to do it myself and I didn't really end up doing as much cooking as I thought I would because the food in Thessaloniki is SO GOOD that I ended up eating out most of the time.
Finally, if you are sensitive to smoke you may occasionally catch a hint of cigarette smell. It's not a non-smoking apartment and there are smokers in the building so I don't think there's a whole lot that could be done about this, we just found some scented candles to deal with it. The apartment was very clean, so this is nothing to do with the host. But a person very sensitive may want to know that. Saying that, someone VERY sensitive may be challenged in general because people smoke everywhere. Again, I loved the location....this part of the city is beautiful, there were a few good places to go to eat close by, and the city center was just a 15 minute walk away. I really enjoyed the area and would stay here again for sure.