Sustainable, Affordable, Fair, and Efficient (SAFE) National Flood Insurance Program Reauthorization Act of 2017 This bill amends the National Flood Insurance Act of 1968 to extend through FY2023 the National Flood Insurance Program (NFIP). NFIP policy coverage limits for residential and nonresidential buildings are increased. NFIP premiums, surcharges, and fees may not be increased by more than 10% each year. The Federal Emergency Management Agency (FEMA) must provide: (1) loans for mitigation projects, and (2) other financial assistance to qualified households for NFIP premium payments and mitigation projects. The limitation on Increased Cost of Compliance (ICC) coverage (offered by NFIP to cover the cost of flood mitigation measures on certain structures) is increased to $100,000 and ICC eligibility is expanded. This bill prevents the Department of the Treasury from charging interest to FEMA on amounts borrowed for NFIP through FY2023. This bill directs FEMA to revise: (1) directives related to the Write Your Own program, (2) specified elements of the claims process, (3) the appeals process for claims and flood map determinations, and (4) certain flood risk zones. FEMA must study business interruption coverage and participation rates in specified flood zones. This bill also makes changes to: (1) FEMA's mitigation assistance programs, (2) the usage and collection of specified surcharges and fees, (3) the scope of coverage available under NFIP, (4) requirements of NFIP engineers and adjusters, and (5) regulations relating to the disclosure of flood risks on rental property. This bill amends the Biggert-Waters Flood Insurance Reform Act of 2012 to reauthorize through FY2023 the National Flood Mapping Program.