That is a really hard question to answer. Montenegro is a small country, but nevertheless there are many cities with pros and cons in all, for doing business.
I suggest you visit and make your decision based on that.
The capital is active year round.
The coastal cities mostly during the summer months (covid19 has vastly impacted the business and tourism)
School will be an easy choice once you're decided where to live. There are two international schools in the capital and two at the coast.
Tijana
