Florist type mini roses
are very hard to care for I believe. I had 2 and kept one inside, planted the other outside and they both died. They are grown in certain conditions and then seem to decline when taken out of those conditions.
New soil/transplanting may have put it in shock--if all of the leaves are gone and the plant is totally dead then it may be beyond repair....I'd get rid of all the dead leaves/buds and hope to see some new growth.
Indoor plants I like: Wandering Jew, Philodendrons, draceanas, African Violets(not too hard to grow with good light and bottom watering and feedings).