Translation of mercantile in German

The guy at the reception was pretty friendly and gave me keys of the hotel's suites. The first suite was again without windows. I returned and asked for the same with windows. He gave me other keys.
The bus driver drove so quickly and with extremely dangerous maneuvers. We were so afraid and the other passengers started to scream at the driver which did not help the situation at all.
I'm writing you in English because I don't have a lot of time and writing in German will take me a long time. Just a few corrections: you can not say in English How you do, you need to say How do you do...