it must be 'Villamayor de Monjardin' - between Estella and Los Arcos - a nice (but basic) albergue on the top of a hill.
Last may, a young Spanish, David, was hospitalero - very helpful and regarding.
You don't say which of the albergues you found the chinches in - was it the one by the bar, run by the Dutch protestants, or the one on the right as you enter the village ? The Dutch have special mattress covers that are meant to prevent bedbugs.
By the way- thanks so much for your advice on how to flush them out - we used it all the time and it works !