All the interior items are split in themes. For example, the reception scene is made from items in 1_Generic and 5_Classroom png files.
Talking about the licence it is all writen in the description:
Complete version LICENSE (paying at least 1.20$):
YOU CAN:
- Edit and use the asset in any commercial or non commercial project
-Use the asset in any commercial or non commercial project
YOU CAN'T:
- Resell or distribute the asset to others
- Edit and resell the asset to others
Credits required (this link)