"In the study there is a desk, a cabinet, an armchair and a sofa."
Translation:A dolgozószobában van íróasztal, szekrény, fotel és kanapé.
It is a little controversial. The rules of grammar say that if you have more than one thing, it should be there are, so you are not "wrong" if you choose this.
But the problem is, most English speakers don't follow this "rule" and say there is if followed by a/an.
It can sometimes sound a little weird if you say there are a/an (except for things like there are a lot..., there are a thousand..., there are a variety of, or there are a multitude of..., and so on)