In short: One of the best value-for-money Airbnb's you can find (if not THE best). NOT good for late-sleepers and if you need an elevator.
Pros:
1. Location-location-location. The flat has AMAZING location!!! Literally 70 meters from Monastiraki station+square. 150 meters from city central market. Tons of bars, restaurants, cafers, shops just nearby. Everything modern-Athens has to offer is in a walking distance.
2. Though that well-located, it's in a quiet side street.
3. The best-possible check-in process. Just follow the instructions, and you're in. An excelent start to one's visit.
4. Newly-renovated.
5. Squeaky-clean.
6. Great amenities: private shower+toilet, AC, WiFi, TV, fridge, micro oven, iron, sink, towel-heater (oh, yeah...).
7. Wonderfull communication with owner.
Cons:
1. Read carefully the owner's info and other visitor's reviews about the noize issue. To put it simple: don't plan on sleeping after 08:00. If you're an early-waking person, you won't even feel it.
2. Read the elevator-issue just as carefully. It stops only at the 4th floor.
3. The bed matress is soft. Depending on your personal taste, that could be a issue.