We enjoyed our stay at Kosta's place. The apartment was as described. Kosta sent very detailed check in instructions and was quick to respond to our questions.
Location is a residential neighborhood 15-30 min walk from main attractions in Athens. Aircon cooled place down quickly which was great as it was a warm spring.
Easy walk from public transport.
Not a complaint, just a point, the balcony overlooks a small courtyard but wasn't the best view if you're looking for an aesthetic view while sitting out there. We were on go, so never used. Overall enjoyed our stay and appreciated Kosta and his place!