Irine's place is nice and she's a friendly person. There have been some minor issues in the beginning but they got resolved rather quickly.
The place has a nice, cosy feel to it, and the view from the terrace (which you have for yourself) are amazing. I liked the location too, not in the middle of touristic area so quiet, but just a few minutes walk from all the action.
It's worth noting that there's no kitchen and not even a sink (you need to wash dishes in the bathroom), so definitely don't plan on any cooking or food preparation (fortunately Naxos has plenty of great tavernas and bakeries).
Internet was so-so, sometimes bit slow but not much worse than Greek standard.
I wouldn't recommend it for anyone with impaired mobility as the stairs are steep and narrow, also I wouldn't risk taking them being drunk so if you're into heavy partying maybe look somewhere else.
In general I can recommend it, I had a good stay overall despite some minor flaws.