anyone own rental properties on here?

When I was looking into doing this (I haven't) i was told two things...

1. Property values "historically" go up around 7%/yr over time. you'll have ups and downs but over time, the avg was around 7.
2. Rent is typically set around the same as what a house payment would be (ish) for that home based on the comps etc.

Those that "do this" will know better/different but I thought I'd toss this in for discussion sake at least.