We were with a group of 7 people and stayed at this apartment for 6 nights. The stay was very enjoyable! The beds are very comfortable, there are enough seating opportunities for large groups, and every closet has a safe (I believe). The Fridge was very clean and spacious, and so was the freezer; there were even ice cubes still in there. The dish washer was very easy to use, and the air conditioning units were quite powerful and did a good job in cooling the whole place down fairly quickly. There are multiple outlets very close to the bedside table, in a perfect location for charging your phone or power bank while you're sleeping. There was a set of towels provided for everyone, and they were quite nice as well. The location of this place is just amazing, it's right in front of a park and right next to the Metro Station Theseio, from which one can take the metro to Monastiraki and then switch to other lines. Alternatively, one can also walk to Monastiraki, in which case one walks through a street lined with nice restaurants and touristy shops. An Acropolis entrance is within walking distance (12 minutes). There is also a supermarket (Market In) very close buy, and a bakery (Dimou Bakery) even closer. The balcony of the apartment is also in a good location, it is almost always shaded, either by the house itself or by the trees that line the pedestrian street the house is on. It is also wide enough to be able to put a chair on it in order to read. Lastly, the host Mary is very nice and always reachable! We had a problem with the washing machine, that is the washing machine broke with someone's clothes in it, and within one day there was a technician that got the clothes out, and one day after that a brand new up to date washing machine was delivered and connected, which works like a charm. Also regarding any other questions we had, for example regarding the Wifi or the garbage, she was super quick to help.
There is however one small detail that I did not like so much, and that is the speed of the wifi. Since this place is quite big, there are always many people logged into the wifi network, and it is not really equipped to handle that. It was usually quite slow for all of us, so I recommend having some mobile data in case you need to do something important on the wifi.