Advice for upcoming trip

Hi everyone, I'm travelling to Jakarta in April for work and added leisure time. Was wondering if there are recommendations for places to visit? I've been to Jakarta once before and done all the tourist sites so want to see more of the city, interesting places and everyday life. 

I speak Indonesian and am happy to travel, especially using trains/MRT. Have 2 free weekends before work events Monday to Thursday. Yet to book accommodation but will be either Thamrin or Blok M. This might depend on where's the best place to go.