Expressing 'our' for objects belonging to our apartment

Question

Should I write Два балкона находятся у нас в квартире or Два балкона находятся в нашем квартире I am trying to write that we have two balconies on our flat.

Answer 1

Both options are fine, except that one small grammar error has to be corrected:

Два балкона находятся у нас в квартире.

Два балкона находятся в нашей квартире.

As a native speaker, I would say simpler:

У нас в квартире два балкона.

Or: В нашей квартире два балкона.

Or: У нас два балкона.

Answer 2

Belonging is transitive so either form will do.

Answer 3

"находиться" can be roughly translated as "to be located" or "to lie" (as in London is located in England), so it's an awkward word choice for your case. It would be a fine choice if you wanted to talk about the actual location of the balconies rather than the mere presence:

С левой стороны находятся два балкона. - Two balconies are located on the left side.

In your case it's best to use a form of "иметь" (as in "Наша квартира имеет два балкона") or "быть" (e.g. "В нашей квартире [есть] два балкона).