On a side note, one professor seemed glad to be my advisor but he is abroad untill the end of August so there might be problems signing the letter of acceptance, unluckiness over nine thousand

I hope things turns well at the end but I do not know how many chances I have, currently waiting for the International Office to get back to me by e-mai.
Sorry, I forgot to write some details in that e-mail: even though what you say is true, my embassy told me that I have to send them the placement form AND LoAs altogether by the 12th of September! What is worse, they also told me that they want me to send hard copies of the LoAs. Therefore, if the professor is in German until the end of August, it is virtually certain that I won't make it within the deadline.
The professor was really kind to me saying that if the international office sends the documents to him, he will write the LoA and then send it to me as fast as possible, but 1. I contacted the international office for advise and I do not know whether they will be positive about it or not and 2. I would feel guilty towards the professor because he would have to send the documents himself while abroad for work. I am already causing problem to him and I am not even there (which would be my first choice anyway...). The other option suggested by the professor, is that he fills in the LoA and then send it in PDF format to the International Office, but I do not know if they will accept it, that would help a lot though...