Looking on the internet deeply has found these results:

in the room is the most popular phrase on the web.

at the room 1376,000 results on the web	in the room 1157,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Breach the Asylum BTA. The last band to play on stage at The Room is now looking to book gigs Mosly and 2 others at The Room Egypt. so Contact Vern Room Thanks Respect / Support Vern So my friends and I wanted to celebrate a birthday at the Room last Saturday; we nearly waited in line for about 40 minutes. This European bouncer by the name ... We really enjoyed each moment in our game and had soo much fun at the room, .... album: Wall of fame — with Noha El We ended up running into another girlfriend, who informed us that she actually works at The Room. She invited us in for a drink... to which we hesitated.	And there were no bags in the room. Franklyn, the lion is not in the room. Here, in the room with you. I saw you in the room with her. He's standing in the room with someone. I'm the examiner in the room right next to yours. 'cause it's scary in the room all alone. There was no one in the room when we got here.

at the room

1376,000 results on the web

in the room

1157,000,000 results on the web

More popular!

Breach the Asylum
BTA.
The last band to play on stage at The Room is now looking to book gigs
Mosly and 2 others at The Room Egypt.
so Contact Vern Room Thanks Respect / Support Vern
So my friends and I wanted to celebrate a birthday at the Room last Saturday; we nearly waited in line for about 40 minutes. This European bouncer by the name ...
We really enjoyed each moment in our game and had soo much fun at the room, .... album: Wall of fame — with Noha El
We ended up running into another girlfriend, who informed us that she actually works at The Room. She invited us in for a drink... to which we hesitated.