I am in a similar situation and left this past Saturday in a rental for a week. It's a Class C on the Mercedes Sprinter platform which is the closest I could find to the Class B that I'm really interested in. It's expensive, but I figure worth it for the introductory experience. But, I'll offer up a few words of advice, especially for a first time RVer/renter like me. When the rental company shows you around your rig, make absolutely sure that they demonstrate everything! I had done a lot of research but several systems were glossed over as if I should just know what to do. And, I didn't insist that they show me that everything works. For example:
1. The TV does not work with a DVD. I followed the instructions implicitly and I'm not a tech idiot but could not get the DVD to play. Called the dealer and they eventually said it probably is the HDMI cable. OK. Don't you guys check this BEFORE the rig goes out on rental.
2. I was told and quickly shown that the curtain dividing the driving area from the rest of the rig just goes on by velcro BEHIND the seats. We looked, but no velcro behind the seats and the curtain was way too large anyway. My wife finally figured out that it goes across the windshield and then over the passenger and drivers windows.
3. We paid extra to be outfitted with appliances, dishware, etc. Well, the cord on the coffee maker was too short to reach the nearest outlet which is over the galley area. We bought a short extension cord to solve this but again, doesn't anyone check this stuff?
All pretty minor irritants but I figure for the price I'm paying there should be absolutely no glitches.
On the positive side, so far we are having a great time!