We spent two nights in Athens during our trip to europe last summer, we could not find accomodation in the center, only the overpriced 5 star hotels. We found this little hotel, about 3 euro cab ride from the center or a nice 30 min walk, lots of shops nearby so it does not seem so bad.
It was clean and decent, basic stuff, nothing fancy, a/c worked but not cooled enough the room, there was a heatwave about 110 F those days....
The manager / owner was a nice person, helped us getting boat tickets to the islands, ordered a cab when needed.
This hotel I would not reccomend with young children, definetely not the place for them, and also not for a long stay, 2-3 days is fine if you do not want to pay big bucks in the center. more