Katerina apartment is really nice, just renovated. Clean and tidy. Check-in was super easy, same for check-out. The area was good for me as I had 15 minutes walk to work. I recommend the place for a single person also for a longer stay, but you would need to arrange something for your laundry. I would come back to rent for my next business trip, just probably not in winter as the apartment is one floor below street level and I was there during a really cold week (it was snowing in Athens!) There is an aircon in the bedroom, and Katerina provided another small heater as soon as I asked for it. It was helpful.
Thanks Katerina!