Oltian was very responsive to messages and proactive in reaching out to make sure everything was going well and see if I needed anything. Excellent host! His family has a shop around the corner, so he's very available if you have any questions or problems (which I didn't).
The location is just off a well-lit main street only a couple blocks from the popular Psyri neighborhood and in very easy walking distance from Plaka, central metro stops like Monastiraki, and all the historic sights you would want to see (the Acropolis, Kerameikos, the agoras, lyceum, etc.). I didn't take a bus or tram once since walking was so easy, although there is a bus stop right around the corner if you want to take public transit.
The apartment and building were clean and well kept up, with easy but secure access through a lockbox and door codes. I felt very secure. The building has a vending machine inside and mini-marts within a block. The rooftop was a nice touch, too, where you could sip a coffee in the morning with a beautiful sunrise view of the Acropolis. The apartment had all the amenities, wifi, good heat and hot water, comfortable bed, and cooking equipment in case you wanted to make food.
But (unless there is a restaurant strike like one day during my visit) there is no reason to cook at home, since there are plenty of restaurants and cafes within a few blocks in all directions, from neighborhood gyro places and Chinese food to upscale French restaurants and cocktail bars with park-front tables.
All in all, I had a very comfortable and enjoyable experience here, and it was a fantastic value for the money. I would definitely come back again!