I have been visiting Ain't Nothin But Blues Bar for the past four years and as a big fan of the blues it is without question my favorite night out in London.
If you arive at the bar early enough to get a seat I recommend ordering a bowl of chilli from the vat kept in the corner. It's not cheap but will set you up for a long sweaty night of top notch authentic blues and boogie.
The music at Ain't Nothin But Blues Bar is always fantastic. The regular house bands all know how to get the joint rocking and on occassion I have been fortunate to see such legends as George 'Mojo' Buford and Big Pete Pearson there, as well as the best of new British talent like Ian Siegel and Paul Lamb.
For the record I have never experienced any problems with the staff. Most are friendly and all are characters.
If you love the blues and are in London you can't afford to miss Ain't Nothin But Blues Bar.