We had a great experience at Maria's apt. Very clean and well maintained. The host was there to check us in and went over any nuances with the space - water heater, AC, locks, etc which was very useful as places in Greece seem to be not quite as straight forward as I anticipated.
The space is located perfectly. 500ft from the first Olympic stadium, right across from the national gardens and a 10-15 minute walk to Plaka. The walk was really nice and exploring Athens on foot was one of our favorite parts of the trip - and this apt is a great home base.
Highly recommend.