My wife and I had a great stay in Ios. The location was perfect just at the foot steps of the downtown core (chora). Very easy to get to via public bus from port. The view is excellent form the patio, and you feel in the mix while still having your privacy. We visited end of September/early October so there was no crazy young people partying on the streets. Generally calm and very local feel (locals hanging by the street, people playing basket ball on the courts, few people walking along the streets). The room is good for two people, bathroom on the smaller side (the shower specifically), nice big patio.
As for the host, Nikoletta is a pillar in the Ios chora and is clearly well liked by her peers. She is a great person to have as your hosts as she knows everyone and can help you with whatever you may need. She is extremely kind and helpful.
Overall we had a great stay and would not hesitate to stay here again!
PS yes there is a cleaning fee to be paid at the end of your stay, $15 euro/4kg load at the downstairs laundry store where you need to drop off your towels/bedsheets.. So just factor that into the low rental price.