Unfortunately we only stayed with Dejan only 1 night, but we were very pleased.
The apartment is nicely decorated, has a big balcony and a great view. You can go up to the apartment with the elevator which is helpful if you have heavy bags with you. It has a big TV and fast WIFI.
The kitchen, bathroom and bedroom were equipped with everything you needed for a long and comfortable stay: full plate and cutlery set, coffee machine, blender, microwave, stove with oven, hair-dryer, washing machine, ironing board and iron, storage for your clothes and I think even an extra bed. The apartment actually has another tiny balcony that comes in handy if you want to open it for sunlight and fresh air in the bedroom.
The only downside was that the bathroom was a bit small. Not a dealbreaker, this might be the average size found across the city.
Dejan was always very prompt in replying and arranged for us to drop-off our bags when we arrived from the airport even if it was earlier than the check-in time. Unfortunately, he was not able to meet us when we arrived but arranged for Vesna to get us settled in and she was very welcoming. Communication was not a problem as she spoke English well.
Dejan was very accomodating, the apartment is close to 2 metro stations with good bakeries, eateries and markets around, and you can get some good Instagram shots in it ;)
We recommend Dejan as a host and would definitely stay with him again when in Athens!