This place is a perfect to stay during a holiday in Athens! The apartment is spacious, clean, nicely decorated and easy to reach from the city. We loved the area Exarcheia, which is known for being a bit more rough, but we never felt unsafe here. When you visit Athens, you should really read about the history of this area. The apartment has a nice balcony with an overview of the Athens Polytechnic University and the National Archeological Museum. The kitchen is well equipped, the bathroom clean (nice shower!) and the beds are very comfortable
Elias gave us some good tips about the city, but Athens is really easy to wander around and explore by yourself (by foot, public transport of by taxi (we often used 'Beat' taxi app for this). Of course you should visit the Acropolis and museums, but Athens is also wonderful for vintage shopping, good coffee and lots of culture. We also enjoyed the nightlife, there are plenty nice bars, restaurants and (small) clubs. When you get the chance, and when it's open, you should really go to Crust Basement: a pizza bar with a club inside the basement. Six d.o.g.s is also a popular place, but we think it will be best in summer, when you can sit and chill outside as well (that was a bit too cold now for us).