We chose Athanasios' studio because it was located very close to where a friend of ours lives in Athens. In terms of location, it was easy to get to and from via one bus (X95 to stop 'Ilisia') direct from the airport and is also near a subway station, although we didn't use this. There are several kiosks, supermarkets, restaurants, and fast food places within walking distance so you are never too far from supplies. It is about a 20-minute walk to get to Syntagma Square/'town centre'. When we arrived we were greeted by Athanasios' parents who were very friendly and gave us the keys and a brief tour of the studio, which was sparkling clean and very tidy.
We did unfortunately visit at the same time that the COVID-19 pandemic was escalating, so many businesses, attractions and locations in Athens weren't open for business in the interest of social distancing, but we still had a great time exploring the city on foot and especially enjoyed walking through the beautiful National Gardens and seeing all the wildlife there, as well as getting breakfast pastries and spana kopita from a bakery in Kolonaki Square and some great drinks, music and atmosphere at Mpriki bar in Plateia Mavili which is just up the street from the studio. We also attended a fantastic jewellery-making workshop at Leontiadi Jewellery which we found via AirBnB experiences which we highly recommend.
The only things I would say to be aware of when booking to stay here is that it's a practical space and pretty utilitarian. It is great as a bolthole to come back and rest in the evenings after long days of exploring Athens and excellent value, but if you are looking for something more luxurious it might not be for you. There is not much natural daylight as it is a basement studio (which can make it hard to tell what time of day it is when you're inside!) and the bathroom is a wet room which works perfectly well, but you may struggle with if you have poor mobility as it is a couple steps down from the rest of the flat with a low ceiling and is quite a small space. Also, the hot water is on a system where you have to switch it on to heat for 20 minutes before you can use it so do be aware of that (unless you like cold showers!).
It worked perfectly for what we needed and we would recommend it to anyone needing a convenient base of operations to explore Athens - a comfortable, clean and practical place to stay.