There is /are a bathroom, a dining room and two bedrooms. Strictly speaking, it should be "there are" because several things are listed. However, in everyday conversation and informal writing, native speakers frequently use "there is" (very often contracted to "there's") for the plural case as well as the singular.
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Mr WordyI would not use it in formal writing thoughSorry, I wasn't thinking very carefully when I wrote this. Having just mentioned a "plural case" I had in mind that we were talking about plural nouns, which is a little different from your example. Let me try again.