So I kept googling and finally figured it out!
It looks like it'll be ~45minutes
Take R2N train to Barcelona-Clot-Arago, Spain stop and walk to hotel
How safe is the Barcelona-Clot-Arago area to the hotel? Are there pickpockets looking to get me on a weekday night as I'm walking to the hotel?
The cab ride looks like it's going to take 1/2 hour so I don't really save much time by getting a cab and it costs 40 Euros vs 2 Euros if I buy the T10 card.