1) I did. Very good experience that I would recommend as I found out much more about the school from my student host than I did from the school presentation and tour. There is also a hotel just two blocks from the school (Commonwealth Park Suites) that I had a reservation at before I decided to stay with the student host instead. It was $100 for the night had I decided to stay.
2) Downtown Richmond is a pretty nice, quaint place. Lot of nice restaurants, shops and the like. Just make sure you don't go EAST of downtown, that place looked pretty bad 🙁 Although, the east part looked far enough away, past a freeway etc so you wouldn't really end up there by accident.
3) I don't think so. I only found out who my interviewer was when she came to pick me up.
4) The interview feedback page hit all the numbers for me. I interviewed with a 4th year and I had a few questions about my app, activities, hobbies, and then a few generic medical school ones like "name a situation where you were stressed and how you dealt with it".
Hope that helps, good luck on your interview!