The short answer
The best single family property management software is the one that handles many owners cheaply, because 100 homes usually means 50 to 90 separate owners who each want an accurate statement. Propertyware is built for single family but starts at $250 a month plus an implementation fee of twice the monthly price. AppFolio has a 50 unit minimum and a reported $298 monthly floor.
Letting costs $94 per month billed yearly for up to 150 homes and $224 for up to 500, with owner statements, inspections and unlimited staff included. It does not collect rent, screen tenants or list vacancies: tenants keep paying into your bank account and Letting reads the bank export.