Very helpful and nice host. Yannis is certainly a very experienced host and knows many things about Athens. Besides offering several recommendations, he would offer to pick you up personally from the airport in his personal car which is very useful.
His knowledge of Greece is vast and it definitely helps if it is your first time in the country and would like to go about touring the cities and different provinces.
The apartment is small but very cozy and it helps that there is a helper, Mrs. Vasso, who diligently cleans up the area daily. There are basic amenities necessary and above all, there is wifi and air-conditioning during the summer.
Would recommend if travelling in small or large groups (but not too large) as the apartment is substantial to about 3-5 persons, 5 being the maximum.