The 4 cubic foot refrigerator is fine for food. It holds probably more than you will use on the road when it is just two people for a short duration. What it lacks is room for drinks. I just got in the habit of shuttling drinks as replacements when one was taken out rather than think I have to keep them all cold. The freezer does lack space.
The old and newer Sprinter seats are both comfortable. You sit upright in both. Sitting up is actually more comfortable for long distances, IMO. The older model Sprinter does not have an adjustable steering wheel but to be honest I don't recall ever adjusting our newer model Sprinter steering wheel. You might say the older is more "bus" like but I never found it a problem. It is different than an auto but you quickly get used to it. I actually liked it.
The newer model Sprinters do have quieter engines and cab areas. The older Sprinter stock radios were worthless, IMO. I don't know if replacing it and the speakers would help.
2015 Advanced RV Ocean One Mercedes Benz Sprinter
Previous Class Bs:
2011 Great West Van Legend Sprinter
2005 Pleasure-way Plateau TS Sprinter