Eisgrub-Brau was founded in 1989 and is located in a distinctive stone building with a tall octagonal brick tower. The brewpub occupies the lower levels, having the atmosphere of a cozy dungeon with arching stone and brick walls. The stone facade has large arching windows, and the one on the right showcases their shiny copper brewing vessels. You can get a better look at these inside. Outside are several long wooden tables under a black awning, enclosed by a concrete and metal fence. Above the entrance is their large colorful oval logo. Inside straight ahead is their 8-chair wooden bar. Behind are shelves of steins and a copper top tower with 5 taps. They have 3 house beers on tap: Light Marzen, Schwarzbier, and a rotating seasonal. These are served in a great variety of sizes, the smallest being 200mL glass mugs, and they sell a meter long board of 12 of these minis. The most commonly poured size is in their 0.5L white steins. They also have 1L glasses, and 3L or 5L table towers. They also carry a guest bottled Weizen beer. Their approachable menu is pub fare with salads, soup, pasta, sausages, schnitzel dishes, steak, pork knuckle, and other classic dishes. The staff speaks English and there is also an English translation menu, which is convenient. The staff does a great job making you feel welcome and the service and kitchen are relatively quick. Around the bar area are high top tables, and several televisions for sports (football). To the left is a dining room with plenty of tables. To the right is a room with more tables and their partitioned brewery where you can get a close up look at their shiny copper vessels. Nearby are stored bags of malt for the next batch. Behind the brewhouse down concrete stairs is a basement dining room where they have two stainless steel lager tanks. The downstairs rooms have plenty of tables and televisions for sports. Up a few stairs are a few more dining tables in their lagering room. At both ends of the room are 5 stacked horizontal stainless steel lager tanks. In a parallel upper room is their fermentation room which is behind glass windows. It has 4 open top fermenters where you can see the bubbling magic happen! The architecture of the place is long narrow rooms like tubes with arching walls painted white. The floor is wood and tile and the low ceiling has soft lighting and pipes running for the brewery. They've done a great job making efficient use of space, and the place has a fun, social atmosphere. Apart from the Gutenberg Museum, this cheerful brewpub was a highlight of my visit to Mainz.