I would like to apologize for this very belated reply. Due to an oversight, I missed out your question altogether and it was only a while ago that I was able to read it.
Yes, you need to remove the indefinite article “an” altogether from that statement you presented. It’s because “an” is an indefinite article that’s used to precede a singular noun whose spelling begins with the vowel “a,” “e,” “i,” “o,” or “u,” as in “an apparent mistake,” “an elegant gown,” “an iconic personality,” “an overland trip,” and “an umbrella.” When the singular noun begins with a consonant like “b,” “c,” “d,” and “z,” the indefinite article is used instead to precede that noun, as in “a ball,” “a caravan,” “a doll,” and “a zebra.” (In the case of definite nouns but not proper nouns, of course, the definite article is used to precede them, as in “the wall,” “the ocean,” and “the apartment.”)
By the way, I used the word “statement” for what you presented above because it really doesn’t qualify as a sentence in the absence of an operative verb. An even more accurate description of that nonsentence is a “fragment”; this is because unlike a sentence, it doesn’t convey a complete thought. Now, when we drop the grammatically faulty article “an” from that fragment, it becomes what’s called an extended noun phrase: “affordable transient rooms in Baguio that can accommodate almost 8 people.” We can then use it as a subject in sentences like “Affordable transient rooms in Baguio that can accommodate almost 8 people are hard to find in the height of summer” or as a direct object in sentences like “We found affordable transient rooms in Baguio that can accommodate almost 8 people” (the whole noun phrase “affordable transient rooms in Baguio that can accommodate almost 8 people” is the direct object, or receiver of the action, of the verb “found”).
Of course, the noun phrase “affordable transient rooms in Baguio that can accommodate almost 8 people”—without the “an” preceding it—can also be used as a stand-alone tag in, say, a classified ad like the following:
Affordable transient rooms in
Baguio that can accommodate
almost 8 people. Along Kennon
Road. See to appreciate. Call
Tel. 444-9XXXX.
When only one transient room is involved, meaning that the noun is singular, that's the time “an” will be needed to precede the noun, as in “an affordable transient room in Baguio that can accommodate almost 8 people.”
