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, as she said it might be too much of a spoiler to explain anything about Heaven, let alone if they suffer from an overpopulation problem like Hell or not. The only thing she can say about Heaven is that it's a very cool place, and a cool part of the story she's really excited to get to later on in the series.