Even though out a bit of the centre, it's very well connected via public transport. All it takes is 15 minutes to reach Monastiraki.
The apartment is located midway between Acharnon (a street bustling with restaurants, and commerce, close to Metro station Kato Patisia) and Patision (where numerous buses run frequently to center). The neighborhood is calm and safe.
Room was really BIG... About 23m2. With a big closet and a balcony giving on a playground - I spent the early hours of the day there enjoying the sun and the quiet.
My host was very attentionate, she replied to my queries almost instantly, with clarity and in detail. All went smoothly from beginning to end.
Apartment has a living room where I met other residents (three, including the owner & me). We chatted, shared drinks and meals - almost an hostel experience - without the crowd and the hustle to use the bathroom or the kitchen.
Kitchen and bathroom were well equipped. All was clean and tidy.
I was very happy for the price I paid. The place is definitely worth much more.
Highly recommended.