Several Tony le Tissier has several books that cover personal memoirs though most start at or about Seelow including:
Race for the Reichstag
Death was our Companion
Berlin Battlefield Guide
Personal memoir of a youth
Helmut Altner - Berlin Dance with Death
Interesting and detailed book on the Volkssturm
David K. Yelton - Hitler's Volkssturm: The Nazi Militia and the Fall of Germany, 1944-1945
For something different though not specifically what you are looking for but includes a lot on Berlin 1945:
Tim Heath - Hitler's Girls: Doves Amongst Eagles