Heaven

Heaven is a location in Hazbin Hotel. This place hasn't been shown in Hazbin Hotel yet, but Vivziepop said that it will be explored later in the series.

Current Speculations
According to Vivziepop in VIVZIE STREEM- Test Test -#1, she can't talk a ton about Heaven yet and she can't say much, let alone if they do or don't suffer from an overpopulation problem like Hell. The only thing she can say about Heaven is that it's a very interesting setting, and she's really excited to get to it later in the series.

Dave Capdevielle and Vivzie confirmed in Vivziepop's VIVZIE STREEM- MAMBO No -#5 live stream that they can't talk a ton about Heaven yet. Dave also said that they have a lot of fun ideas planned for Heaven that they don't wanna revel. Viv said that it's not a mirror image. And it thrives and operates in a similar way. It's a very different landscape with a different attitude. Dave said that he doesn't want to get into the whole Heaven aspect because they have something really fun planned for Heaven but they don't want to spoil it. Viv also said that wants to keep Heaven under wraps as they can until it's revealed in the show. Viv wants to start showing it as soon as Episode 2, but fans will probably not get the biggest scope of it until much later in the show.