My teenagers LOVED staying in a castle! There's just something about a turret, right?!
Favorite things: 1) the castle, obviously. 2) The views of the Mississippi River were gorgeous, especially at sunset. 3) There was a mess up with our welcome email so we didn't have the door code, but communicating with the owner was super fast and easy and we were in right away. 4) Plenty of TVs and viewing options.
Less great things (not necessarily things the owner can fix): 1) The oven burns the bottom of everything before cooking it all the way through and there are NO food staples in the kitchen - so bring everything with you. 2) There are 3 kinds of beds: a U of bunk beds, a queen bed in a private room upstairs (meaning, it has a door), and a king bed in the upstairs living room set apart with a screen. The queen and the king share the upstairs bathroom. Luckily, my kids all slept down in the bunk beds so my husband and I had the upstairs private to ourselves (no door, but our kids are old enough to not come upstairs), but if someone was sleeping in the queen, there's no privacy. 3) There are showers in the two downstairs bathrooms, but the upstairs bath only has a clawfoot tub and a shower wand, which is great for baths, less so for showering (no curtain). We just showered downstairs.