The lakehouse basement vacation was absolutely lovely. There are many boat and swimming opportunities to get out on the picturesque lake, or just get a good campfire going and watch the sunset over the water. If sauna is your thing (as it very much is ours), this is a great place to do it, although the lake is too far away to jump into post-sweat. We had a fantastic week at this property, and would recommend it with the following caveats.
The indoor space, while generally well-appointed, and provided with special touches (i.e., s'mores supplies), is definitely a basement, notwithstanding its pleasant furnishings. That means it's dimly lit, with a low-ceiling, few windows, and only the main sliding doors for ventilation (this became an issue for us, when smoke escaped the fireplace into the house, and there was basically nothing we could do about it.) We were fortunate to be able to spend our week mostly outside by the lake, but if forced inside by inclement weather, the basement would not have made for a very pleasant getaway.
The only other thing worth mentioning is that I felt we had two different hosts. Debbie was lovely and accommodating in person, and even rescheduled the sauna repair to ensure that the out-or-order sauna was made functional for us. But the written materials are simply unwelcoming. In addition to a long list of rules, of various reasonableness (upcharges for daytime guests?) with threats of cancellation if they aren't followed, there are harsh-toned, all-capital admonishments taped to the walls concerning particulars of the plumbing and ventilation, and the house guide instructs guests to treat the home as that of their "rich uncle in the South of France to which you'd like a return invitation." All of this tends to cast the renter in the role of the hosts' layabout nephew of little means, to whom a great favor is being done by making the basement available. It's all a bit much. That said, this is nothing a cold beer, a campfire, and dip in the cool lake can't fix.