My DD did Erasmus in Italy and Switzerland. Her university told her that the only organised universities are in Switzerland and Germany, so at least you have got that one sorted - althoughit maynot feel like it for a bit!
I can tell you that Italy was utterly disorganised - be thankful your DD is in Germany. The brief details are that you have to find your own accommodation as there is no student accommodation because most Italian students live at home. OK, but you have to be really organised to find it! She found it whilst still in Switzerland and I booked her into a hotel in Bologna while she finalised viewing of flats and secured one.
Lectures were OK - but they did not examine on the lecture content - oh no! Something completely different because the syllabus was huge and the exam questions were not based on the content of previous study. Only the name of the artist remained the same. You had to know, in detail, all his works (100 plus). If you guessed right, hopefully you may stand a chance of passing. Not that she had to pass, but she wanted to. The Italians mostly failed. They had loads more exam dates so they could try, try and try again. The successful written exam candidates had to do an oral exam to pass. Except the Japanese students who were told they only had to do the oral. When they turned up to so it, they were told they were not allowed to because they had not sat the written papers. They produced the email exempting them. Chaos!
During the lectures, which never started on time because the lecturers were outside having fag, a sizeable minority of the 100 plus students then chatted, ate and snogged all the way through. A few sprinkles of snow - no lectures. Lecturers not turning up - all the time. Change rooms and not tell the students - all the time. You get the picture..... The city and travelling around was fun and she made loads of Erasmus friends from all over the world.
Switzerland - super room allocated by the university overlooking the Alps, complete with balcony and hammock. Wonderful Swiss students in the flat and at the University who really helped. Invitations back to Switzerland - including a wedding. First class lectures as you would expect from a world class university. Bologna has slipped down the world rankings but it is still the top university in Italy and the oldest in Europe. It has 88,000 students though!
If there are problems - find other helpful Erasmus students who speak English! Bound to be some Brits/Australians about! Usually they make contact at specially arranged Erasmus events. I think you do have to be resourceful to do an Erasmus year. When DD was asked recently at a job interview what was her proudest achievement (is that English?!!), she replied, the Erasmus year! A young person really comes of age doing one. Your DD will be fine. Germany is not far. Book in for a long weekend!
Just one thing your DD might like to consider. Upon return to university there are very few year 4 students left. Lots of friends will have graduated. Therefore do say to DD to keep in touch with people doing her course! Also, people she may know doing other 4 year degrees so she has a group of friends to return to. This is vital if she is relying on them to find a flat for year 4. In my DDs university city, this took place in January - not when she returned in July. It might be different elsewhere, but she said she relied on others to find the flat and include her. You definitely do not want to be Billy No Mates.
Hope all goes well.