That is a very good price. Our 2015 Axis already had 1100 miles on it, new, and we paid $72. We haven't had the issues you mention, but I would be concerned about any electrical issues. I do think that can be fixed by the dealer.
We traded in a Sprinter class C like yours, and we actually think the Axis is quieter. We do notice a slight squeak on the front right side of the cab that we haven't identified yet, but we were so used to the banging door and table in our old motorhome that it doesn't seem so bad.
We agree that the oil filler tube is in a weird spot, but once you find it you know where it is. We plan to do our own oil changes.
Parked, the Axis is more stable and we don't have rocking issues like we used to have while camping. That is a nice bonus.
If you decide to buy, make sure the shower wall liner is securely attached! And do let us know how it goes!