This issue is a variant of Donald Duck Comics Digest (Gladstone, 1986 series) #1 [Newsstand edition].
Barks was given a half-outlined plot by de Maris and polished the gags and lengthened the story.
"Owl Roomer" is the title in the Table of Contents. "The Dubious Guest" is the unofficial title from the index for Walt Disney Comics and Stories #205. There is no title on the story itself.