Souphaphone guest house
I think this guest house is opposite the Lao Silk if the decent pub is the Hare and Hounds....
The Souphaphone Guest House is in the small Soi that runs between the Lao Silk and the Hare and Hound.
The one opposite the Hare and Hound (and probably the one Chris means ) is the Sinnakhone Hotel (Tel 856 21 217 244) another recently opened guest House with rooms at 600 Baht per night.
They are all in the same area of Francois Nginn Road alongside Wat Mixay.
If you want a quiet drink forget the TexMex (a dump anyway) and head for the Khop Choi Dieu, a beer garden / restaurant, next to Namphu Fountain.