I would definitely recommend Loukia's place for several reasons! The appartement is very clean and comfortable, it has everything you need for a pleasant stay. Moreover, it is nicely decorated and I felt as if I were in a hotel (but better). The neighborhood looks a bit impoverished if you ask me, but you're close to main attractions and other nice neighborhoods.
Loukia was very welcoming and had an organizer ready with tips on Athens. Very lovely host!