We stayed in the apartment for 4 nights. The apartment locates in the heart of Exarcheia. Close to many nice restaurants and coffee shops. This area can be loud at night and also there are many young people hanging around in the streets, but it didn't bother us.
It's about a 15-20 minutes walk from most of the tourist places like Acropolis, Plaka, Monastiraki, and more.
The apartment itself is very cozy, clean, and nice. The downside of the apartment is its lack of natural light but this is a common problem in most of Athens's apartments.
Wifi is perfect. There are two tables that you can use for working on your computer so it's great if you are a digital nomad.