Konstantinos' studio is perfect for a couple. It also has a futon that can double up as a bed, if there are three people looking for an affordable, centrally-located place to stay in Athens.
The home is situated in a small, charming lane right off Syntagma Square, filled with cafes and bars. My husband and I were able to walk everywhere because the main sights and fun neighborhoods were within 10-15 minutes walking distance. Konstantinos was efficient and responsive. I would highly recommend his home - but it's a popular place for tourists, so make sure you book in advance.