the.frollein

As per my understanding, under a working student contract you can only work a maximum of 20 hours per week during the semester. During semester vacation, i.e. "Vorlesungsfreie Zeit" you can work up to 40 hours per week. 

  Sorry, I'm not on TT as much as I used to be - just saw this. SnowingAgain is of course right, and I should have been more precise: Non-EU citizens must leave Germany and the entire Schengen zone for 90 days, before being legally allowed to return.   Source: German Ministry of Foreign Affairs

What you were told is not entirely correct. Non-EU citizens are allowed to stay in Germany for 90 days, but they must then leave for 90 days, before returning for another 90-day stint. There is no "re-starting the 90-day countdown" if you leave the country for a day or a week.    To get your passport stamped, ask at immigration when you go through the line. 

As @JN53 wrote, Deutsche Bahn issue a vorläufige (temporary) Bahncard which is valid right away, and they will send you your regular Bahncard (credit card format) by post. 

  About 2 weeks after I moved into my present apartment, I had a blockage between sink and bathtub, and the Hausverwaltung called the plumber. Not sure what the Vormieter did, but it was obviously not my fault - thank goodness. Plumber's advice was exactly what AlexTr said: regular doses of boiling water, which I have done since and never had any problem.

@Bimohan: You don't seriously expect anyone to reveal their "mushroom places", do you? That is a closely guarded secret for most people.   We only pick those that my GerMan can 100% identify - I don't know enough to try, so I leave the decisions up to him. However, even so, last time we picked we caught a Bitterling (bitter-tasting mushroom) and the entire Pilzpfanne was ruined.       

Please ask your lawyer - without knowing exactly what the wording is in your employment contract, it's impossible to say. Most will specify to the middle/end of the month. 

Just to update this in case others are looking for an English-speaking hairdresser: Frau Bronner's English is "not great" (her words were: "das ist schwierig") - so you would need to speak at least enough German to be able to describe what you want her to do to your hair.    Sorry about that, she genuinely is a great hairdresser!

Hi and welcome to Stuttgart - congrats on getting a flat, Zuffenhausen is a nice area to live.  Not in Zuffenhausen, and not entirely sure about her English skills (I speak German with her), but I can highly recommend my hairdresser: Michaela Bronner (google "Friseurin Michaela Stuttgart). Her salon is a one-woman operation, on Heilbronner Straße and 2 minutes walk from the Löwentorbrücke U-Bahn stop (or 5 minutes from the S-Bahn stop Nordbahnhof), so on the main U-Bahn/S-Bahn route between Zuffenhausen and Hauptbahnhof. If you need more info, please feel free to PM me.   I haven't had a perm myself, but her handiwork I've seen on others looks good. I have really fine hair and not a lot of it, and she's a haircut genius - I would trust her to do a good job with perms as well. Best thing is, her prices are amazingly low for Stuttgart (I paid 27 Euros yesterday for a wash and cut). 

  When you go to submit your documents at the Standesamt, they will offer you a variety of choices and you will have to tell the Beamte what you choose. I was also under the misapprehension that the rules were very rigid and was pleasantly surprised at just how flexible German bureacracy has become in some (very few though...) regards.

Having grown up as a third culture kid before this was a thing, I set out at 20 to go back to my roots, back to where I belong... until I found out I don't belong there either. Ah, the idealism of youth. Bounced around a lot and spent time in many different countries, and figured out early that home is where I am at the moment. And if it doesn't feel right, then I can move on, and start over. Problem is, at some point you get weary of starting over, and that did catch up to me eventually. I originally moved to North Hessen for work reasons, after living in Vienna for nine years - that move was a cultural shock all its own. Been in Germany for 23 years now, and got married to my GerMan last year. Although there are things that annoy me no end here, I am more settled and at home in Germany than I've ever been elsewhere - which is good, because although we both love to travel, leaving Germany to settle elsewhere is not an option for my GerMan.