Wherever you left it.
More seriously though, Harem Hotel has not had an official apk since v0.12, as .apk has a limit of 2gB, which the game has long since surpassed, even at 90% compression.
Fan ultra compressions exist to bring it below that threshold and thus allow it to be an .apk, but it will have severely reduced image quality, especially as the game gets bigger with each update.