Great cheap little watering hole, with a large selection of booze that won't break the bank.
On the Friday I went, I had to stand outside as the tiny building was packed, but this didn't bother me either. It's a good place to socialise whether with friends or work mates, especially in warmer weather.
Only minor point to make; the toilets upstairs are not recommended. They are tiny and the smell is pretty bad. The only other toilets nearby are located inside Euston station.