I just received my new passport from them, except for paying the fee it was a simple and painless transaction.
The street they "just off the corner of" (John F Kennedy renamed Juan Bosch) is one street closer to the Malecon road than parallel road Calle Beller and the office is on the second floor of the side street next to the bookstore Abraxas. If you ask for help finding it, it is better to ask for where the bookstore is because many locals will send you to the old location from years ago.