Numbawan is on the waterfront, basic chairs and tables under an opened canopy shelter. We had cool drinks and coffee on the two occasions we went there. The service was OK, the bonus for us was the free wi fi. The internet service was intermittent so we were able to download emails but not much else. There was no sense that we were rushed or expected to then drink and leave. There is not much ambience and mainly filled with tourists using wi fi.
Not really on your must do list but fine to sit and relax while checking emails.