I have stayed ALL over Athens as I'm Greek-American, and this place is a great deal. I stayed for about a month. If you want convenience, quiet, and a comfy bed, this is the spot! :)
PROS:
Location: Perfect location. In fact, unbelievable how good the location is WHILE being incredibly quiet. I could sleep at any hour.
Size: Very spacious! Loved being on the balcony - there were even days in December warm enough for it :)
Bed: The bed is sooo comfy! Honestly, this is rare for Greeks (I'm always nervous when I stay someone in Greece about this).
Hospitality: Nikolaos and his brother were very attentive and even brought extra items to help with my stay.
CONS:
Needs to be repainted. For this reason, I would say it's not for honeymooners or for business meetings.
Like old Athenian buildings, the heating system is a bit weak.