It was common practice (right up until WW1) for the housekeeper (or Butler) of large & stately homes to show visitors around (for a fee/tip)
This was only done when the family were not "at home",and as such families had often many houses the opportunity for the housekeeper to make extra income was plentiful.
The Lord etc who owned these house knew that their staff "showed" the house to visitors,and the only requirement was the visitors were seen to be gentlemen/women.
Most owners were proud of their houses,and collections,and were only too glad to sjow them off, a kind of boasting about their wealth if you like.
In fact it was a well known pastime if you were staying in the country to be taken by friends to be shown around the local "big house" Rather similar (if you like) to visiting National Trust houses today?
Such was the income to be made from such "tours" that more than one housekeeper retired into a pretty cottage on the proceeds.
Of course some of the aristocracy frowned on the practise,and required their houses to be not shown,but even some of these houses WERE shown without their knowledge while they were away!