tldr: Social staff and repeat clientele. Food is above average for a brunch place. Mussels are to-die-for.
The Real Mo-Mo's is a great brunch/lunch/dinner shop with great drinks and mussels. Let's focus on the mussels. The mussels are in a nice tart broth. The broth does not overpower the mussels. Combine that with the fries and you get a meal comparable to the best mussels places in Belgium (OG home of mussel pots).