Twiglett, a lady knocked on my door about a year ago because she liked the colour of our house and wanted to know what paint we had used. I guess that's a little different to someone asking to see the kitchen, but I really do think they'll probably take it as a compliment more than anything.
This lady was SO lovely, she came to the door and said "I just love the colours on your house, would you mind very much telling me the name of the paint you used" etc etc. I was more than happy to tell her because I was flattered that she liked it. I would just go for it if I were you.