Not Recommended!
Me and my mother stayed in this hotel for one night. We had booked it two nights but couldn´t stand it. The place was a joke!! We are not the comfy types and like unusual places, but this was too much even for us! The room was tiny, with tinytiny shower + wc (you almost needed to stand on the toilet seat to make room), with a small window facing a dirty alley/back yard, the blind wouldn´t open, and that was almost lucky, so depressing was the view. The floor was all cracked , probably due to water-damage from the shower. The beds were so uncomfortable they seemed to have no mattress. The place was noisy, you heard steps in the stairs (no elevator) and doors slamming all night. The air condition was noisy too, and when you turned it off you heard the ones in the other rooms, humming like a slow, but steady, highway. No terrace or balcony in the room made it a craustropfobic stay. Maybe the hotel have other, nicer, rooms, but I wouldn´t take the chance to find out. The only thing good was the nice and helpful female staff in the "lobby".
Unique Quality: The location is super if you want to see the Acropolis 24-7. But, I would recommend other travellers to find accomodation a little off the very city centre, in a calm area where locals live. Everything is more expensive around the sights, and when the places close there isn´t any normal daily life going on around you. Hotel Tempi is cheap, in every meaning of the word. I would go for a hostel instead if on a tight budget.