We stayed with a group of friends and our kids (6 adults, 4 kids). The cottage was clean and well equipped. It's on the Muskoka river and swimming off the dock was a highlight for everyone. The hosts were responsive and helpful for the few questions we had.
The only issue we encountered was that the cottage does not have great water pressure, which was challenging from the perspective of having showers, doing dishes, and getting baths organized for the kids. I asked the host about this, and his response was "this is a limitation of the cottage".
I feel like more could be done about the issue, frankly, I have been to several cottages on lake water that did not have issues like this. To be fair, if we were fewer people it would not have been as difficult an issue and easier to work around (however, the cottage has 4 bedrooms so really I don't see how this is unexpected).
Absent the water pressure issue, I would happily have given this 5 stars and the cottage was very well equipped. Otherwise we had a great time and everything was smooth.