Hi @rusicat and welcome. There are no stupid questions. Those that you wonder about are the ones that may become important when you are on a sit.
Often you can find answers by using the spyglass option and searching your key words. The conversation about sheets and towels has been active and ongoing for a while and you’ll see a wide range of opinions.
I often ask about bed size, especially if I am using my car and it will be far more convenient for travelling, to take my own bedding home to wash. The first time I asked about the bed size, leading into that conversation, I was told it was a king size. I only have sheets for double or queen, so I had to pass on my idea. I do take one of every towel, including kitchen linens. That way I can easily wash theirs the day before and use mine on the last day.
Here’s another post with lots of responses on basic household supplies.
Make sure to ask about any details, if they’re not provided. It makes things clearer for you and the homeowner.