My home originally had carpet on the second story but because of my dogs, we decided to change it for easier clean ups. We decided to select the original flooring company so we can have the same exact material and cutting style for the whole house. One person completed the whole second story plus the stairs. the job took just over a week as we were not in a rush. The baseboards was put back on and sealed properly except for a few minor cracks during removal. Floors are level and no gaps in the rooms and hallway. Minor spots were filled with corking where the stairs are that can't really be helped.
Overall, I am quite happy with the finished product. If they offer baseboards repairs, furniture moving service, it'll be even better. But of course, this will increase the budget...
One thing that I wished they told me was that because it was winder and they had to cut the wood indoors, there were a lot saw dusts. i don't renovate much but next time if i was told to cover all my stuff in the garage, they i wouldn't need to clean up as much.