One thing Severus had learned very early in his association with Lucius Malfoy was that one never argued anything having to do with money with him. Never mind that his wealth and prestige wasn't worth pants here, Lucius was Lucius and Severus would pay him the respect he deserved.
"Very well. Thank you. I'll have the stout, it's quite good here."
He made his way to the table and flicked his wand over the space to ensure the table and chairs weren't sticky with the residue of previous patrons. He added a Muffliato Charm for good measure, not that he expected they'd discuss anything that required security. Lucius valued his privacy as much as Severus did.