If you are after a place in Athens that is in a great location, and with value for money, then this is the place for you. I stayed here for three nights with my partner.
Sleep Easy was very accommodating during our stay, by being very responsive during check in, and opening Athens up with a lot of local tips. The location is ideal for the classic sites (either a couple stops on the metro, or just as easy to walk there.) It is also near a lot of great food places that do great souvlaki and treating yourself to some Loukoumádes after. The place itself is simple, but if you are in Athens for only a few days, then this should not matter to you.
If you want to explore Athens, and value for money is on your priority list, then I would recommend this to you!