I stayed here for 32.5 £ per night (B&B)
Gatwick Bed and Breakfast
Frequent bus number 20 (every 20 mins) to CAA (bus stop - City Place. Ticket cost 1,5 £, journey time: 15 mins)
They have wi fi but the signal is very low so you might have to stay in the dining room to get it.
Some pubs at walking distance.
Plenty of others B&B on the same road.
cheers