Ioannis and his brother are extremely helpful and nice people. I had a problem with my luggage which tugged in Athens and they talked to the airport and solved the problem. For every problem they have a solution :)
The area around Katarina rooms is perfect, lots of restaurants, shops, the old harbor, near the central bus station but in a very calm and cute street, so that you can sleep very well. I really enjoyed staying there and can highly recommend it!