I'm fine with Harry finding out about the safe house. It's his ability to get away unnoticed without a security escort in such a way so that people won't track him down to the Burrow or Lazslo's and start asking uncomfortable questions that I'm concerned with.

At this point, we're juggling far too much in terms of security, and his spending any significant time at Grimmauld right now is not something I am willing to risk.

The only thing I could see happening would be Harry meeting some of his friends for tea at Lazslo's, with Remus, Sirius, and Tonks thoroughly maintaining their respective covers. However, I think we all should agree that the entire purpose of all of this is intensive learning, and taking extra time from all of that for a social tea is going to be complicated.

It's not happening this time, I'm afraid.