“How did you enjoy your stay, Mr. Robinson?”
You work at a hotel. A guest is checking out. You want to know if he's satisfied.
How did you enjoy your stay, Mr. Robinson?
"How did you enjoy ___?" means "Did you enjoy ___?" You answer by describing your opinion of that thing.
How did you enjoy the massage?
How did you enjoy your trip?
People often ask "How did you enjoy ___?" to someone who they're not very close with. It's not a very personal-sounding question. If you know someone better, you ask "How was ___?":
How was your first day at the new job?
"Mr." is a title that you use before someone's last name to show respect. It can also be written "Mister".
For a complete explanation of when to use titles like "Mr.", read this article.
Hotel employees use the phrase "your stay" to talk about the time that you spent there. For example, they say things like:
Please enjoy your stay.
How was your stay?
If there's anything I can do to make your stay more enjoyable, please don't hesitate to ask.