Lots of crash pads in EWR, with transportation to/from airport provided. The real sticky part with EWR as previously alluded is LGA trips, particularly the early AM departures. Percentage varies month to month but it's generally around 30%. Since most people try to avoid it during bidding, the junior line holders and reserves get it disproportionally.

You can travel between EWR and LGA via train/bus, but that's not an option for a 5 am show time. Hotels around EWR are reasonable; hotels around LGA are around $180 / night out the door. The "lounge" in LGA is a couple of couches / recliners in a 12'x14' room right next to the ramp, so it's not really well suited for a full night's sleep. You do get cross town pay for LGA trips ($90) which just about offsets the cost of Uber to get there, but you still have to get up an hour earlier to make it over there.

I'm not as familiar with DCA/IAD, but the 320 does fly out of BWI as well as IAD. If you're thinking long term, try to pick a domicile where you might like to move to rather than doing a double commute. That will quickly get old (and make you grow prematurely old).