Pipe burst at 2am? Basement flooded after a storm? The first 24-48 hours matter a lot - water gets into walls and subfloors fast, and that's when mold starts. You need someone who shows up the same day, not three days later with an appointment window.
A good restoration crew brings industrial dehumidifiers and moisture meters, not just shop vacs. They'll map out exactly where water traveled - which is usually further than you can see - and dry everything to industry standards before any rebuilding starts. If they skip the moisture mapping, they're guessing.
Most jobs go through homeowner's insurance, so make sure whoever you hire documents everything with photos and moisture readings for the adjuster. Typical jobs run $1,500-$8,000 depending on square footage and how long the water sat. If it sat more than 24 hours, expect the upper end.