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Wilcos do some good cheap hooks. They're rubberised so they don't scratch up whatever you hang on them, real cheap too.
My bike storage is really narrow but pretty tall. Just a standard width door to get things in and out too which is a bit awkward. I have one hook to go under the stem and one for under the saddle. When I get round to selling the Carrera it'll make things a bit easier, more than two bikes is a bit too cosy in this space.
These
http://www.ikea.com/gb/en/products/small-storage-organisers/hooks-hangers/rigel-hook-galvanised-red-art-10051305/
are great bike hooks