sadly not yet but i'm planning to do so this year, i have a company in Jordan and between work and flights from France to Jordan i struggle to find any time to visit Germany and to be honest i'm quite fascinated by the German architecture.
a small advice: don't stay in Amman all the time visit other places in Jordan you will have a lot of fun doing so, madaba for a start would be perfect and not just the down town area or the churches, i would recommend you visit the villages, they have an extraordinary craftswomen there with amazing products, from simple carpets to clothes of all kinds, i think the most famous one is Bani Hameda village.
for safety reasons make sure you don't wonder off alone or go in strangers houses and please don't accept any offer of a tour with young men, it's safe there but it never hurts to be careful.