Respectful, cultured global citizen looking for a quality place to stay in berlin city, short-long term OK

Good day! Thank you for reading this. I'm an MBA student from Shanghai, moved to Berlin at the end of 2018 and plans to live here for at least another year. I'm now looking for a short or long term lease in a single / studio apartment. WG would be considered if the existing flatmates are respectable, cultured and well-travelled who I have common ground with.

The apartment should come furnished with an oven, microwave, fridge, bathtub / shower and definitely wash machine. Communal laundry room won't be considered.

I'm definitely easy to get along with and can make a quick decision, which makes me a very good customer, but that does not mean I'm stupid. So, please, only serious offers from honest vendors should apply. 

Desired locations are Schoneberg, Prenzlauerberg, Charlottenberg and Mitte, but will consider all options. 

Thank you!