Question 1

Where is Daiichi Seimei Hall?

Accepted Answer

Daiichi Seimei Hall is in Chuo, Tokyo, Japan. You can see its exact position from the map coordinates and the Street View link.

Question 2

Which scene of Apocalypse Hotel does Daiichi Seimei Hall appear in?

Accepted Answer

Daiichi Seimei Hall appears in EP4 of Apocalypse Hotel.

Question 3

Can I visit Daiichi Seimei Hall?

Accepted Answer

Yes. Daiichi Seimei Hall is a real place you can visit. Check what it looks like on Street View before you go.

Question 4

Where was Apocalypse Hotel filmed?

Accepted Answer

Anime and manga are not filmed the way live action is. Their backgrounds are painted from photographs of real locations, and Daiichi Seimei Hall is one of those real places (EP4).