I would want more large windows/sliders so I could see the lake. One of the reasons we love our tiny lake house is because of the view.

In the hall bath upstairs, put only one sink. Visitors will have stuff with them and will need the counter space and drawers on either side, and they likely won’t be brushing their teeth at the same time.

If I were staying in a lake house, I think I’d want the laundry to be convenient for throwing in beach towels and clothes dirty from fishing, and a place to drop gear etc. so, maybe an enclosed breezeway and protected paved area between Garage and house.

Is it an ugly lake? Is there a second garage that you indicate is not shown? Trash the barn door on the laundry room. A local architect with experience in designing lake houses will be a better investment for you.

What struck me was that most of the windows and garage entry are on the front of the house. Normally most windows would be on the lake side with the garage opening on the other side. Depending on how steep the yard is and where it is located having people drive around the house to enter may not be the best idea. You also need to check to see what type of rooms are allowed above a garage. Some areas only an open area will be allowed. Plan in advance for egress windows in the basement. Easier to put in when building than later.

If allowed a place for parking boat trailers would be needed.

I should add that the house is in the midwest. It's going to be a little bit up on a hill from the lake and unfortunately, no great views of the water from the house. You have to walk about 150 yards to the lake, where there is large boat dock with 2 slips, kitchen, and top deck also.

Particularly full or larger beds should not be against the wall. If two people are sleeping in them, someone must be climbed over.

You'd significantly increase the function if you added a generous combination laundry/mudroom/pantry to the first floor. People need a place to dump stuff when they walk inb, especially a lot of people in a small house.

Is it your intention to rent only to one household at once? I could see this working for parents (they get the master), a teenager (they get the full/queen), and little kids (they get the bunk room). But I don't see this working well for any group with two sets of adults who don't usually share a room. Like, say you want to rent to two couples and their kids. Or to parents, grandparents, and kids. Or two single moms and their kids. Or whatever. For those groups, someone gets the generously sized master with a large private bathroom, and then whoever gets stuck with the cramped queen room sharing a bathroom with the kids has seriously drawn the short straw.

I think you'd probably have broader appeal if you had the same bunk room for kids, plus two bedrooms roughly of equal size, both that fit a king, and both with their own bathrooms. Both those bedrooms could be smaller than the current master and still be adequate, and the bathrooms could be small and basic as long as they're not shared.

Ask your drafter to show you sections through the stairs and how the first to second floor stair will encroach on the first floor space and stair to the basement.

Please, if you are going to rent no full size beds, do at least queen size!