I've been in Tasmania for the last couple of weeks, and we're staying exclusively in Airbnb. I'd have real trouble dealing with a hotel, they give so little value for so much ($).
Launceston: Beautiful restored terrace house on the edge of the CBD.
Coles Bay: Modern cottage, about 30 metres from the waterline, and 50 from the local shops.
Hobart: Awesome loft apartment right above the action at Salamanca.
Deloraine: Huge, restored, grand old lady of a house.
Stanley: Yet to come, but should be another restored old homestead.
Cost in all cases was about the same as a supposedly superior level of hotel room...as opposed to multiple bedrooms, our own kitchen and lounges, and decent off street parking (that isn't an extra as it is with all hotels these days). You do need to plan ahead, as the best places are always popular, and will be gone. Treat them like SQ awards...you need to book the better part of a year ahead. Worth noting too, that the cost of the Spirit of Tasmania is also a lot cheaper further out. Short term it's cheaper to fly and hire.