It’s easy if you use the third-party dashboard, smart tiles. Very popular in the community. And directly addresses this issue. In the past people have used it when they didn’t want a child in one bedroom to be able to turn off the lights in the other child’s room, or for a housemate that they didn’t want to have full access to the system, etc.
Each dashboard can be customized so that only the devices you want that person to have access to are available.
It runs in any web browser so it will work on most smart phones. 
www.smarttiles.click
There’s also a very popular thread in the community just to discuss ideas for different hardware options and customized displays for use with smart tiles: