I would totally recommend this place! We stayed there for 6 days and the flat was very clean upon arrival, bright and well-equiped. Perfect for 3 to 4 people. It's a 15-20 min walk to the metro station Victoria (line 1) and is located in a lively neighborhood, with bars and restaurants.
Tzogia and her daughter are great hosts, they made sure to provide everything we needed for our stay and have been very helpful for any question and information we needed before and during our vacation. As a bonus, there are many guide books and leaflets at the flat to make the most of Athens!