Hand-to-hand can be something of a misnomer, in that it is often used as an example of hyperbole to indicate the ferocity of urban combat, and is not necessarily literal.

That being said, urban warfare gets up close and personal, and Stalingrad is in the running for most brutal urban combat of all time, and there are examples of journals from both sides where the authors specifically mention and describe hand-to-hand fighting in close quarters.

Edit: I will note that the primary source letters and journals with which I'm familiar were translated into English, and were exclusively from the Soviet perspective. I'm not sure hand-to-hand is a figure of speech in Russian the way it is in English.