Sharing an apartment in LA

Buffy and Spike share an apartment in LA, pre-soul, after they were randomly assigned together. She works at a diner, under the name Anne. They fight and break many things in the apartment. At some point, they communicate only through notes on paper.
It was a pretty long fic.
Thanks!

You're looking for Living Conditions by sweetprincipale, it is one of my favourites.

Set in early S. 3 with a few changes: Buffy is still working in LA, she never had the run-in with Lily that made her decide to go back to Sunnydale, and Spike's come back to California already. Both of them are living completely separate, unrelated lives until fate and its sick sense of humor throw them together. Part angst, part fluff, and of course, eventually a little smut. Rated: Fiction M, Words: 81,840

That's the one, thanks!