The closest Metro station, imo, would be Tenleytown/American Univ., at 4501 Wisconsin Ave.; from there, you can ride any of the 30 (30, 32, 34, 36) buses down Wisconsin to the 2400-2600 block of Wisconsin, where Max’s should be. Tenleytown/AU is on the Red Line; there are other stops you could get off at – Dupont Circle, where you’d take the P Street Line (G2) to get over to Wisconsin, but then you’d have to catch a bus up Wisconsin. Or you could ride the Blue Line to Foggy Bottom/GWU, and catch one of the 30 buses headed -up- Wisconsin. I think the Red Line Tenleytown stop is probably the best bet.
Good luck! Heh, now I’m thinking of heading over there for some of that Pumpkin ice cream. [:p}]