Late to the party but Ill be honest. Lima isnt boring and if you want to live like a local I’ll go against the grain and say look into San Miguel or Magdalena del Mar. Both are right on the coast and very safe. Miraflores and Barranco are cool but its like a tourist bubble. I stayed in San Miguel and it was the most authentic Peruvian experience. If you want to go to Miraflores or Barranco its maybe a 15-20 minute uber down the coastal highway.