Hmmm.... I remember Spartanovka off the Mod and it was pretty fun and decently large, with a number of windows you could pop out of.
I still remember being a german trying to run from spawn to behind the train cargo containers/trailers before Russians started MG'ing or picking you off from the tall building on their side, while the Germans had a multi-floor building of their own you could pick Russians off from their taller building or from the alley-way they came through via their spawn.
I imagine the RO2 one is much larger and far more detailed, but a good map to re-introduce and improve on.
I'm looking forward to trying it out.