"... you obviously need to change something."
That was the advice an innkeeping consultant gave us at the PAII conference last March. His point was that you're not making something clear or need to give additional information or have a way for your guests to find out what they need. So if you get the question "where is the iron and ironing board?" five times or more, you need to put that information somewhere. We're still working on that one, since the rooms in our historic house aren't set up to have an iron and ironing board in each room. However, what we can do is have a "where is it?" list in our guest information book in each room for items commonly requested by guests such as a first-aid kit, sewing kit, restaurant menus, and so forth.
The same principle holds true for issues to be addressed or problems to be solved. If you get the same complaint or guest comment five times or more, you should think about changing it or fixing it. Some issues, especially in an old house, are structural and can't be changed. That's part of the "charm" of having an old house! But there a lot of things you can change or at least address, or let the guest know that you're aware of it and it's on your to-do list. Thank them for their suggestions and comments, and they'll be happy that you listened to them. I like to draw them into the problem-solving. "Yes, I've been thinking that for a while. Here's what I'm thinking about doing......[ ] What do you think about that?"
I've taken this "five times" principle into my work space and personal life as well. It used to be that if every time I pick something up or go to do something and think to myself, "this really bugs me," eventually I would one day say, "enough! Just fix it! Do something about it!" After all, if you've worked with something five times and every time been unhappy with it, isn't it time to change it? Catch it early and save yourself some annoyance and aggravation later--just fix it!