Nikolaos's apartment is seriously THE BEST! It is the perfect location: 2-3 minutes walk from Monastiraki station, the neighborhood is teeming with restaurants and stores, and the Acropolis and many touristy sights are within walking distance (although it may be a tough walk if it's hot). Additionally, the apartment is super clean and incredibly well-stocked, and having two bathrooms is nice. Nikolaos was very responsive and accommodating.
There are a couple downsides but they are very minor. You can definitely hear loud music from nearby bar(s) at night, but it is muffled. If you are a light and early sleeper, it could be an issue, but it was not an issue for us. Also the WIFI was slow, and my boyfriend could not do any work with it. Once again, not an issue if you plan to just explore Athens and stay off your phone/computer. :P
We would absolutely love to stay here again if we come back. If you had any hesitation about booking this place, just book it now! Thank you Nikolaos for an amazing stay!