I'll be staying in the Mitte section for 5 nights in February. Any suggestions (all price ranges OK) would be greatly appreciated.
June

Taken from my Prague/Berlin trip report.

A traditional German pub/restaurant near the Arcotel Velvet:

The desk clerk (a different one this time) said there was such a place 2 minutes walk away right where Oranienburgerstr. meets Friedrichstr. Sure enough, just across Friedrichstr. we found the Baeren Schenke--at least that was on a sign at the door; hopefully it's the name of the place.

Another German place on the river Spree by the Museum Island--brews its own beer:
The hotel had recommended a couple of places near the museum island, so we headed for one of them: Brauhaus Georgbrau, Spreeufer 4, along the river just across the Rathausstr. bridge.

A very pleasant place--clean; shiny copper brewing equipment. We all went with small Georgbraus as we still had a lot of sightseeing to day. Very tasty. For our late lunch, 2 of our group had Brandenburg Bratwurst with mustard and brown sauce, Sauerkraut, and potatoes. Another had just a nice salad and potato soup with sausage. I ordered the special--Eisbein (boiled leg of pork) with Sauerkraut, mashed peas and boiled potatoes, a small beer and a schnapps, for € 9,99.

Everyone enjoyed their food, but my dish was definitely the hit of the meal. Never tasted better, more tender, succulent ham/pork. I gave everyone a taste and then had to beat them back away my plate. I would definitely return here--though in the summer I could imagine it being very crowded with its nice location along ther river. There is a statue of St. George and the dragon in the little square by the restaurant.

An upbeat and good Italian place--again not far from Arcotel Velvet:
the Italian restaurant our last night in Berlin was "Cavallino Rosso" -Hannoversche Str. 2
tel 030 - 27 90 83 14
All of the staff (I'm not sure they were all Italian, but I am sure they were not German--at least the ones who waited on us) were very upbeat, smiling, gracious, and welcoming. We were able to quickly arrange drinks (3 Prosecco with Holunder Sirup and 1 Camapari and soda). A couple of toasts and a few laughs later our wonderful appetizer platter arrived.

I must note that English was not really spoken by any members of the staff we encountered--but with our few words of German, their few words of English, hand gestures, smiles, and a couple of drawings, we managed to have a great meal. Not quite sure what each and everything we had was, but it was all delicious and none of it was moving on our plates.

Anyway, we had ordered 4 different appetizers that came out on one platter for us to share. All excellent. For the main courses we had: Pasta with lamb sausage (melted in my mouth, and so savory); ravioli with truffles; a wild boar special of the evening; and pasta with mushrooms, crayfish, and garlic sauce. Again, all excellent. Had a nice wine Novelle d' Montepulciano to accompany the meal. For dessert, panacotta with strawberries, affogato al cafe, and pistachio tartufo--plus coffee.

Oh, the food section of Ka-De-We department store was also excellent.

I loved the Cafe Mohring by the Gendarmenmarkt for breakfast. I ate there every morning when I was in Berlin for 5 days last May when I stayed in the Mitte.

Also, for dinner I would recommend getting the weiner schnitzel at Lutter & Wegner's, also by the Gendarmenmarkt.

Do you know if the KaDaWe department store is open late? Can you have dinner there or would it be better to go at lunchtime?

From their website:

Monday – Wednesday: 10am - 8pm
Thursday and Friday: 10am - 10pm
Saturday: 9.30am - 10pm
Sunday: closed

Either lunch or dinner would be fine.

I've read that this is a wonderful food hall so it should be fun. Thanks for the info.