I use streetcar too, they're ok to use during the week after work. On weekends they tend to get booked pretty quickly, so you need to be up before 11am. I struggle with that... for long weekends, zipcar is much better, they're not around in dulwich but there are a few in brixton(37) and others in oval(185). they offer double the millage and they end up being much much cheaper for a weekend than a streetcar.