Do you think starting a business in Hamburg as an interior designer would feasible? Would there be any call for it? My wife is very stylish and creates amazing spaces so am exploring the possibility of setting her up in business.
If she is amazing then she might be in demand. Otherwise she's in a competitive market with little client base IMHO.
Chenck out similar companies here:
It's an affluent city. There's every chance that people would want the servive. The trouble is whether there would be enough clients to make a living out of it.