Translation of stepfather in German

Mr. Chang informed me that you have a customer that requires similar applications to what my customers have here in Switzerland. I am planning my next trip and I will consider visiting you too.
Sounds great. Sorry, it took me a while to get back to you. Did you book the Helmhaus (which Monica suggested) or the Seidenhof (which I gave her in the end)? Will make sure, they give you good rooms...
As soon as I went to bed, incredibly loud music starting playing from right beneath my room. The music was so loud that I could not fall asleep despite my jet lag and despite being extremely tired.