Place was clean and shower was spacious with a good hot stream of water.
Bed was comfortable.
Alexander allowed me to check in very early because it was cleaned already in the days before.
The wide balconies on both side give a nice view to other places around the building (in a warmer weather I guess I would've spend more time there).
Elevator stopped working (not mid-operation though) but got fixed within 2 hours after I've reported it to Alexander.
Wi-Fi was slow though (3 Mbps download) so keep that in mind.
The neighbors were somewhat noisy at certain times when they left/arrived to their apartment every day but maybe it was only other temporary guests.
Around the building there are restaurants, coffee places and it's near Philopappos hill so I had a nice hike to the top of it with amazing views of Athens and the Acropolis.
All in all a place with good value with a very few minor issues.