We loved our stay and had an excellent time! The adorable and lovely Yota in the front desk staff was our favorite. She made our stay very special and she was always so helpful.
I know a lot of people talk about the noise of this place, especially on Sundays, but it didn't bother us too much at all and the building certainly wasn't vibrating. I would say that people who don't love the noise should definitely look for another option, but I really didn't feel like it was that bad. Also, I don't think people took into account the giant rave happening just across the street in the meat market just off Athinas street. That was probably the true source of the noise, but it's just a theory.
Breakfast is awesome! I highly recommend getting it included in your stay. It consisted of either eggs or yogurt.
I will say that the kitchen space left something to be desired. I hope the staff can hold guests more accountable for cleanliness and maintenance. Also, all the cutlery disappeared from the kitchen, and then magically appeared one day. I feel like there just needs to be better kitchen rules and tools overall. But don't let this part of the review fool you.
Selina is an excellent place for what I would call flexible people who find joy in all things and aren't super nitpicky about small things.
If you hold very specific expectations of how a facility should be maintained, I would suggest booking a stay with a high-end hotel that will wait on you hand and foot.