Fidias is an exemplary host and you won't find an apartment with a better view in the city. The Check-In was easy and we felt very safe in the building. Wifi was stable and fast.
The only thing, you should consider, since it is near a busy street, at night it gets quite loud from the traffic. So if you are a light sleeper, you should bring earplugs.
Other than that, this is the perfect apartment for exploring the city.