Sven's place is as quality as usual. I've stayed at Sven's place a few times now, and it's always very clean, stylish and very cozy, and generally very well taken care of. Sven is similarly kind and helpful in sorting out logistics.
Cozy place in one of the coziest, friendliest and most relaxed parts of Berlin, with good travel connections to the rest.
What's not to like :)