From what I remember from adopting my dachshund, home visits are to get to know you, your family, your home, your pets, and your over all lifestyle. Just make sure you pick up your house like you would with any company. Keep this in mind when cleaning, : what would you not want a stranger to see and judge you by? Show them any and all pets that you have, and your back yard. Explain what every day is like for you (works, school, anything) and what you plan to do with the dog while you are away. When we got our doxie from DRNA (Dachshund Rescue of North America) they did a home visit. We had literally just moved into that house 3 months prior to getting Bailey. My mom of course tried to tackle as many of them as possible so we didn't look like a slob, but still, they didn't really pay any mind to the boxes. If possible though, maybe put them in a closet?
Make sure you don't have any dog hazards lying around. Take it like this: If you were going to let your chin run around your entire house, what would you not want him to chew, eat, or get into. Same with a new dog, everything needs to be explored by them.
If you are in an apartment, make sure you check with the office to make sure dogs are, in fact, allowed, and have them sign off on a sheet stating that you have checked and show it to the person doing the home visit. I have heard of so many people on the last leg of adoption and they find out they can't have dogs in their apartment and everything is called off. Just plan ahead.
I'm sure your chins won't be a problem. They will probably have the dog check out the cage, but if it shows any fear or aggression, just assure them that you can keep the door closed to wherever they are. Since I was getting a doxie, they saw that I had stairs and told me that we needed to get a baby gate for the stairs. That didn't mean they were going to up and leave and tell us we couldn't have a dachshund just because we had stairs, they just explained that the stairs needed to be off limits due to their back problems.
As long as you were honest on the application, they should know everything about you. The home is just to see how the dog acts in your home.
Just don't worry about it. They are trying to find the dog a home, and if you just act like yourself, show them the everyday you, there should be no reason why you shouldn't get this dog. Good luck!