Dubya

Of course they want to meet you in person, it is the quickest and easiest way to interact with somebody in the working environment. If all it takes you is some time and flexibility, why even consider refusing that offer, for you it is also a great opportunity to see where you would work and meet more future potential colleagues in person. It’s a no brainer and you should be grateful for the opportunity. 

They will paint

You may double check with a native German speaker, but roughly:   Option 1 = treating the ceiling as I said before; smooth out wall and put ingrain wallpaper.    Option 2 = treating walls & ceiling as I said before.    So so if the price difference is minimal, option 2 would be what I’d go for, and the work suggested is certainly beyond my DIY skills...   BTW, from the quote I understand that you still have to buy the paint for the final layer, but I may be wrong, best to clarify that, including how many layers you would need. 

Also not an expert, but what you quoted in German is significantly more than just putting up wallpaper... First of all they include the ceiling. Then they will spackle it, smooth it out, prime it, and paint it. Sounds like you currently have a basic construction wall and I would say they are very right you can’t just paint over it. Probably you would need a lot of paint to make it look nice...

Search for a “Waschanlage” or “Autowashanlage” with “selbstbedienung”. https://www.sb-waschanlagen.com/muenchen/

Yes, your lawyer can.    Probably nobody here understands your story (I don’t). Why would you want to claim back money for which you have received the agreed upon services? Sounds like your landlord is being fair and wants to pay you back what you overpaid. 

Perhaps these guys can help:   https://www.wirkaufendeinauto.de/autoverkauf/auto-nach-spanien-verkaufen/

I think the magic word is “Kurzwaren”; that brings up several shops online and in Hamburg. For example:   https://www.zipworld.de/catalogsearch/result/?q=gardinenband   Does that fit your need?

Stating that you have no rights during the probation period is obviously silly, you have all the rights during this period, including accumulating vacation etc. It simply means they can cancel the contract without stating the reason, so you being fired is unlikely to change, however unfair. They may have realized it takes some effort from their side to employ a non-EU person, including a higher wage, potentially.   I think you have a good point asking for your wage. Them employing a person without the right papers can have serious consequences (also for you, by the way...), and the fact they told you to stay home right away shows that they at least knew some trouble was coming... Them agreeing to reimburse accommodation also shows me they may want this problem to go away quickly... Why not simply ask them to get your salary instead of the reimbursement of expenses?

The max difference between scenario 1 and 2 is 4k, so that is the maximum benefit of waiting (hoping) for an offer you like. So:   - How long can you afford to wait, knowing that costs of upkeep and depreciation will continue? Additionally the hassle of answering interested parties, showing them the car etc.  - How realistic is your expectation to receive 24k for the car you have driven for “a couple of years”? To me it seems like 20k may be a very reasonable offer...   You realize that you may have to pay some taxes on your company car too, right?   PS, never budge on budget when talking with car salesmen, but I guess you know that now...