I visited The Alice House, Queens Park (there is another nearby in West Hampstead) for a business meeting and we sat at the rear in a library area which was most convenient.
This is a very modern bar / restaurant and the staff are so friendly and helpful.
The menu is varied and obviously drinks a plenty.
We actually stayed in the library for several hours while having our meeting and were not disturbed at all; in fact the lovely staff kept replenishing our water.
Well worth a visit in this very trendy area of London.