Will I be able to stay in the house during the  refinishing hardwood flooring process?
There will be noise and vapors during the sanding and finishing process. Whether or not you can live in your house during refinishing depends on whether you will need to walk on the floors being sanded and whether or not you are sensitive to the odours from the finish. Even if you choose a water base finish, the first coat is typically an oil based sealer which does have an odour. This also applies to stain which is oil based. Generally, you should not walk on the floors during the sanding and coating process as it may adversely affect the finish product. It’s a good idea to have a contingency plan for living/sleeping elsewhere if the odours are causing discomfort. This may depend on where the bedrooms are situated in relation to the floor. Refinishing is best done when you can plan to be away for a few days.