We used Harold Quimby and were very happy with the price and quality of work. We had our entire house refinished.
https://www.buildzoom.com/contractor/harold-quimby-t-a-high-quality-flooring
I just used Afford A Floor and found them to be the most reasonable. I chose the slightly more expensive water base finish. All of the companies that I spoke to give a lower estimate if you are doing more than one room.
Looking to refinish 4 rooms and and hallway ASAP. Any recommendations and/or cautions to look out for?