We enjoyed our stay at Elena's apartment, which was comfortable and conveniently located near Cornelia metro station, supermarkets and some nice restaurants.
It is great for families with kids and has some toys for the kids to play with. Just be aware of the need to climb quite a few flight of stairs (no elevator) and the need to go to an external laundromat for laundry. Also kitchen didn't have a few things like a pod coffee maker or toaster, but those were just a few minor gripes. Elena was very responsive with addressing any questions/issues during our stay and even got us a hot water kettle to use when we were there. The area seems to be mostly locals and has a good vibe to it. I would recommend Elena's place.