Loved the place. It's not our first time in Athens. More like 20th. Omonia is not the best neighborhood to stay in, but it's still safe and VERY central. We did not use the metro at all or Uber. Just walked to Psiri, to Ermou, to Sintagma, to the Plaka, to Kolonaki. All walkable.
The place is lovely. Nelly was away but her brother in law Harris picked us from the airport and was super helpful with additional recommendations, tips etc. Wifi was great. AirCon (heater) worked well. Hot water. Everything. I did think there was a balcony/window to the outside, but the windows are all towards a peer. Oh well, it's winter anyway.

Nothing beats Greek hospitality :) Thanks Nelly.