Looking on the internet deeply has found these results:

Double room is the most popular phrase on the web.

double occupancy 13,830,000 results on the web	Double room 125,400,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
So we're finding more of the double occupancy graves. Single occupancy is £55 a night, double's £65.	Yes. 21 from 20... I Regret Sir, There is only left two single room in front or a little double room at the back. We'd like a double room with bath. I was going to book a double room when I rang up, and then... Double room, sometimes not even staying the full night. I can't move from Baltimore to live in a corner double room of your parents motel. Sorry we couldn't do a double room for you boys. Sorry we couldn't do a double room for you boys. It will be a double room for the first week.

double occupancy

13,830,000 results on the web

Double room

125,400,000 results on the web

More popular!

Yes. 21 from 20... I Regret Sir, There is only left two single room in front or a little double room at the back.
We'd like a double room with bath.
I was going to book a double room when I rang up, and then...
Double room, sometimes not even staying the full night.
I can't move from Baltimore to live in a corner double room of your parents motel.
Sorry we couldn't do a double room for you boys.
Sorry we couldn't do a double room for you boys.
It will be a double room for the first week.