Christos and Marta are both great and interesting individuals and couple.
They offered a well set up room, a clean bathroom, and shared a clean kitchen for use as well. The flat is in the 5th story and has balconies (also my romm had one) so there is air and light as well.
The communication was relibale and easy creating a very welcoming atmosphere from the very first moment. They were always available to give hints, answer questions, help out with something, or share a coffee.
They do live in an interesting area of Athens and it is also easy to start from there. You are free to come and go as you please and can discover the city on your own schedule.
Based on my experience I would anytime recommend to stay with them.