We had a very nice stay in Victoria's appartment! we were 4 people (2 couples, my partner and my parents) and the flat was very convenient, spaceous enough for us 4. The beds were very comfortable, the flat clean and tidy in general!
we really liked the neighborhood called koukaki, it's a walking distance from everything you need to see in Athens if you like walking (Acropolis is 15 mins walk, the Acropolis museum only 10 mins, the other sites a little further). And if you prefer taxi, it's really cheap, make sure to use the beat app (we had 1 not very nice taxi driver without the app who tried to rip us off), the app gives you rating on the taxi driver you get, which is reassuring. We never took the metro, since the 4 of us it was more interesting to take a taxi so I can't comment on where the metro is. To come back to Victoria's very nice appartment, it's localisation is ideal, you get many extremely nice restaurants in a 5 mins radius, quite cheap also and there are bars just downstairs to the flat, if you want to have a drink at night. And if you're a light sleeper unlike me, maybe you'd like to sleep with earplugs because a lot of people are in the neighborhood chatting, eating and drinking, it can be a little loud.
And Victoria is so kind, welcoming and nice! we arrived quite late at her place and she arranged to be here and explain everything to us and was also super flexible with our early departure!
I highly recommend!