Hi I had a salon for 3+ years and things you need to know is whether the landlord will do repairs to the building, damp proofing, wiring certificate that would pass health and safety when you have clients. Is it wheelchair accessible as by law most premises have to be. Also how long is the lease, is there a get out clause cos if you decide to close you may still be responsible for the rent till the end of the lease. Always have a solicitor check over your lease it costs but well worth it.
I would also be interested in how much footfall passes the salon are you likely to pick up much business? Are there easy transport links, buses, metro, free parking this really matters to clients. Is there competition nearby that may affect your business, a few tips to help you on your way good luck.