Great place to stay, in a quiet family-friendly neighbourhood; withing 5 minutes walking from the metro Kerameikos, which is 2 stops away from Monastiraki and the city centre. The flat itself is on the 2nd floor, it's not a problem if you haven't got any heavy luggage as there's no lift. It is fully equipped; we stayed 4 nights and needed to use the washing machine which is a plus. There's a smart TV in each room so you can chill watching Netflix if you're bored.
The only inconveniences were the the toilet which doesn't flush very well, you have to press the button quite consistently and the hot water which did not work properly at that time, but the host was very prompt and helpful in giving us advice.
A great place to stay at for a short or longer holiday!!! I totally recommend it!