Short answer: Visit at different times. Check noise, traffic, schools, crime, future development. Talk to neighbours.
Visit at different times: morning rush, evening, weekend. Check noise, traffic, and parking. Look at schools, shops, and public transport. Check crime statistics online. Talk to neighbours. Check council plans for future development. A great house in a bad neighbourhood is a bad investment.
Morning Visit: Heavy traffic, hard to exit driveway
Evening Visit: Quiet, families walking
Weekend: Noisy neighbour party
Council Plan: Major road widening in 2 years
Decision: Keep looking