I have only been during the day (they have a good swimming pool), but I would imagine that you have a few local pubs and perhaps some nightclubs. Most people catch the commuter train to Stockholm when they want something better I think. Södertälje is also a bit segregated so you need to find a place with an atmosphere you like. Downtown Södertälje should have something for you though, and since you're coming in April, you have the benefit of outdoor life in bars, which is nicer than the quiet winter months in a place like Södertälje.
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