Go for it. I stayed here with my partner and it was so convenient for our holidays: 5min to syntagma metro (direct connection to the airport), everything is in walking distance (literally only used transport to go to/from the airport), very safe area (the street is a bit dark at night but it’s just 10m, the others around it have many cafes, restaurants, shops and people, and light).
The bathroom is REALLY small, the shower is very very tiny and the curtain doesn’t reach the floor so it’s easy to get water everywhere.
The kitchen makes it very convenient to cook a few meals in with the fridge, stove and microwave.
The bed is comfortable and bigger than we expected, and the room is spacious.
Wifi was slow so if that’s important to you maybe keep in mind using your own data or going to a café/restaurant nearby might be necessary.
We don’t know if it’s related but both my partner and I caught a cold after the first night there even though we weren’t cold at night.
Check-in was also very easy, we were allowed to check-in early and they showed us the apartment and gave us the keys. Communicationnwas very good all along. I would recommend it, especially for the price. I can’t express how convenient the location was, seriously.