The article aims to describe how good entrepreneurial practices are perceived by all the actors of the start-up ecosystem. The results are based on data built by querying 278 people. It appears that investors, entrepreneurs, incubators, professors and students do not share the same vision of what makes a start-up successful. They disagree on such essential subjects as the role of ideas in entrepreneurial success. They express different opinions about the relevance of certain actions, such as the use of massive press exposure. They are divided about the strategic opportunities to create start-ups on specific activity sectors or under certain conditions.