As many other guests said - the location is just perfect. There are a lot of small cafes nearby, big supermarket and farmacy. The checkin process is very easy and communication with host is really very good. Main square and metro station Monastiraki is about 5 or less minutes by walk, and you can reach out the main landmarks without transport. Actually there is a big fish market in several minutes, where you can but the freshest shrimps and fish.
The apartment itself located is in a building which could scare a bit if you go by stairs :-)
You will have everything you need, even fan and iron, some small things like sugar, tea bags, coffee, shampoo. It's really convenient to have it if you staying long. But there are also some points that could be improved, for example some cooking stuff, like pan and pot. It looks very used. The tap is leaking in the bathroom.
There two spots for wifi network, one of them is really slow, but there is another one which was much better. It was also a situation when wifi was absent but it was not something on hosts responsibility. Anyway Emmanouil was very responsive and worried about. Since I was working there for a week, it was really important for me.
Overall, I would recommend this apartment, I spent a great time there and in Athens itself.