This was my very first interview so, of course, I overpreapred and spent hours reading on healthcare, abortion, stem cell, social medicine, etc. Not to say that it was to no avail (I got asked about a couple topics on later interviews) but it was a little much. I stayed with a married couple. The husband was an MSI and the wife just started working in admissions (after he got accepted). They were friendly and she was helpful in easing my nerves. You probably could not find a better first interview experience.