My wife and I were in Tassie for our honeymoon. We booked a few Airbnbs and Mark’s was our last. We had high expectations (and you probably have too) after seeing the pictures. But we had our expectations dashed when we were greeted by dust balls rolling on the floor, stale water left in the kettle, hair on the bedsheets. The worst was the musty smell that emanated from the fridge and permeated the air. For travellers like us who value cleanliness, we would not recommend going for Mark's.
That said, Mark's place does have a fairly convenient access to Mt Wellington and to Hobart City. It is a drive up the windy mountain road (and is dark at night) so that may put off some travellers. The place is equipped with a functional kitchen but it is your choice if you'd like to try with the cleanliness issues. The views are spectacular especially in the morning.
Alas, we can only surmise that maintenance standards have dropped drastically and the chalet is a mere shadow of its glorious past.