Dirk's place is perfect. Very clean, huge room, on a whole bunch of transit lines. The private bathroom is great, with a huge tub. Other reviews mention street noise so I want to address that too: I am a VERY light sleeper and I was totally fine with my usual earplugs. (And Dirk makes sure he doesn't wake you when he gets up for coffee :) )
Dirk is just a super nice guy, lovely to talk to in the mornings or when you come back from adventures. When I was looking for a place to stay I was specifically looking for reviews from women who'd travelled alone, as I was. If that's you too, I can say I had no problems at all. You can totally trust staying here, not a bad vibe in sight.
Would 100% stay with Dirk again.