Last week we stayed 4 days in the Englishman's Retreat Guest House, 400 baht a night; the rooms were big and very nice.
Glynn is really a nice guy and very helpful, second bonus; his wife is very beautiful!!
The only minus I can think about: rather far away from town and not easy to find a tuktuk in this soi (but they have motorbikes and cars for rent), and the army shooting range at the other side of the street!
It's a nice place to stay. They are just starting up, so there are still some minor things that have to be improved, but overall; it's worth the money for sure

Next time in Udon I'll go to this guesthouse again.
Rudi from Belgium.