We had a great stay at Nasos's studio.
The studio is exactly as described, tidy, clean, and perfectly located in the heart of Athens; walking distance to all the main historical points of the city centre.
Nasos was a excellent host, kind and friendly. He met is up at the train station at our arrival and accompanied us to the studio. He offered us some groceries and water, and gave us a city centre map with some good advice to visit Athens, and also the Cyclades; which was really superb. He even sent us a text during our stay to check if everything was going well.
If we ever go back to Athens, we will not doubt to stay at Nasos's studio.
Thanks!