Giorgos and his brother Giannis went above and beyond to accommodate me and answer my many questions. Giannis even helped me with my big bags when I checked in. And when the weather was unexpectedly cold and rainy, their kind Mueller loaned me her raincoat and an umbrella. Wonderful people!
As for the flat, there are some things Americans aren't accustomed to, like a tiny shower and having to turn on the boiler for hot water or the oven--no big deal, though, and the hot water was plentiful! They're a bit of street noise--to be expected in a city--so bring earplugs if this bothers you.
Excellent location in a very safe area (near the Prime Minister's flat, so lots of police in the area--they were pleasant to me). The upscale Kolonaki neighborhood with its bars and restaurants is an easy 5 minute , and the city center and tourist attractions is an easy 20 minute walk. There are hills and steps to climb, so I don't recommend renting a bike or scooter. I enjoyed walking everywhere anyway.
Lovely place, lovely people, and super safe for silo female travelers myself. :)