What they said, spare room, gumtree etc to avoid the agencies.
If you go through an agency stick with smaller ones, IME one man bands looking after ~100 peroperties tend to be far better than high street estate/letting agents.
If your first impression of the landlord isn’t absolutely 100% great, then they’re a money grabbing douchebag. Assume your relationship* with them will only ever get worse from the time before you hand over ££££’s at the start till you leave, so best fined one you’re amicable with to start with.
* it’s a relationship, they will expect the be allowed to go through your washing, suck up all your money, let themselves in with their key anytime and complain about the washing up. Just imagine it’s your worst ex girlfriend ever, except she also holds the power of eviction over you and there’s no nookie, and you’ll be close to imagining a landlord.