これです。
Question 23: How many students am I allowed at the same time?
Answer: NO, there is no set limit to the number of students that you can host, but each student/guest must have his own private bedroom with a door and window. With exception to couples traveling together, they may share a room, or in crowded resort areas like Whistler BC or the Rockies in the winter or high season, shared rooms must be agreed upon at the time of reservation by the client.
部屋のシェアは本人がOKならカップルだけでなく、リゾート地の混雑時でも許されるみたいですね。
レス10ですが、バンクーバー市のHPに記載がありました。
A business licence is not required to have a homestay or a maximum of 2 boarders or renters in a residence. If you have more than 2 boarders or renters in your home, you need to have a General Business Licence (pay the fee for a Rooming House).