Hi Andy
I have quite a bit of experience of survey design and you might find the following tips useful:
First pages - Include descriptive text explaining who you are, the purpose of the survey and what you intend to do with the results. Most importantly - give some assurances around confidentiality of responses.
Q1 - biographic detail usually goes at the end of s survey, put this up first and it puts people off from completing the survey, put it last and most people will fill it in.
Q2 - Might want to ask what floor flat people live in and include "terrace", "maisonette" etc.
Q3 - Would include "communal stair", "communal green/garden"
Q4 - Outline what you mean by bicycle storage - it could range from a hook to some fancy shed.
Q7 - I normally use five options, allows people to express a middle, neutral view
Q9 - I would re-word this to something like "If you ever experienced problems with bike storage can you explain what these were and how you overcame therm?" This will let you understand what problems cyclists have, how they solved their problem and whether you could sell a commercial version of this solution. In my experience we are a fairly inventive bunch.
I'm sure others could provide better assistance than me.
Hope this helps - good luck.