Elbe 76 is a nice place in between Eimsbüttel and Hoheluft. I recommend it especially for the excellent Sunday Brunch. A wild variety of tasty dishes, not just the typical stuff, but several antipasti, salmon, mozzarella, do-it-yourself waffles, fruit crumble and many more as well as some warm lunch dishes, e.g. pork roast, make the brunch really worth it.
The ingredients are local, veggies for example come from a demeter farmer where I order my own as well. The price for the Sunday brunch (10:00 – 14:00) is € 12.95 and well worth it. Drinks are extra and can make the brunch more pricy, especially since I love to stick around for hours.
Definitely reserve well in advance for the brunch, especially in groups. It is a little more relaxed when it’s warm and the terrace is open but still I recommend to call them or make an online reservation.
Additionally, they have an evening menu that is changed and refreshed regularly. It consists of fish and meat from the grill, pizza and pasta and some vegetarian dishes.