It is possible to edit the names of the sites/rooms. It's also possible to have multiple sites in the same room, just rename it to whatever you like. 

Here's how to: 

iOS:

1. Tap the plus sign in the bottom right corner on the main page (to do-list)
2. Tap “Add site”
3. Pick a site 
4. Choose the settings for that site
5. If you want to edit the site:
6. Go to the site
7. Tap the Settings in the right corner
8. Change name, light, humidity, draft and for the outdoor sites the roof setting 

Android:

1. Go to the tab “My Plants”
2. Scroll to the bottom (on Android, tap on the plus sign) 
3. Tap “Add site”
4. Pick a site 
5. Choose the settings for that site
6. If you want to change the name of the site:
7. Go to the site
8. Tap the Settings in the right corner
9. Change name, light, humidity, draft and for the outdoor sites the roof setting