This is a very unique place with lots of attention to detail in how it was designed and its function. We kept noticing little (and big!) details about it, and we were very pleasantly surprised by the minimal but very functional way it was built -- you can tell it was designed by an architect! The bed is very unusual, but it provides a feeling of safety and cosiness.
We also enjoyed having a projector and bluetooth speaker --
bring a laptop and you have your makeshift home cinema.
It's very near (but not directly in) a trendy part of Thessaloniki, with lots of bars and restaurants, which means that it can get a bit loud around the weekend, but not to the point of being disruptive.
Note that this is located in a building that's mainly non-residential, which means that you don't get the usual ground-level entrance that most block of flats have in Greece, but don't let the exterior deter you at all, the inside is definitely worth experiencing.