The apartment was very clean and has all the necessary amenities for a pleasant stay whether you're coming to work or on vacation. The building is very quiet and the neighbourhood is safe. You have many things to do nearby: some nice coffee places with friendly staff; the national gardens; and the acropolis. The only downside of this apartment is the fact that is does not have direct sunlight. But if you're planning to spend your time outside, visiting Athens, that shouldn't be a big problem.
Maria was also a great host. She is a friendly and joyful person, very responsive and proactive, making sure that I felt comfortable at her place. She left me a bottle of nice white wine as a welcome gift, brought me an extra blanket for the cold days that were coming, and even gave me a lovely birthday gift that she made herself.
I would definitely recommend!