Rebby and his pal Janum are between the - The Ashen Order (Monk Guild) - Theater of the Tranquil (the stage) and - Brownloe Bakery (where you may buy munchies for Pandos). The haffer and the half elf are sort of in the middle of the area, they are not in or beside any buildings.
I visit Rebby when I have a lot of time to kill in Freeport.
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~ Muse Temperance the Elf ~ Lyricist on Erollisi Marr
Hits very hard for level 20 Rogue. His buddy will assist him if you attack. Be careful of the Guard that walks in that area. If he sees you fighting Rebby he will assist Rebby and his friend. You will also take a big faction hit. I went from indifferent to dubious by killing him.