I have not ridden my moto in Tunisia, but I have passed through there many times ferrying aircraft from sub-Saharan Africa to Europe, and my experience has been that Tunisia is one of the most pleasant and stress-free countries in all of Europe and Africa.
The people are generally quite nice, things usually work the way they are supposed to, and the officials are pretty good - much the same as officials in Europe, no better, no worse.
The biggest income-earner in the whole country is tourism, so, they know not to screw that up. Roads are reasonable - not Switzerland, but not as bad as Ireland.
For a first trip to Africa, I think you have picked the best possible place to go.