I used U Store it for about 5 months last year for 10 cubic feet (it's amazing how much stuff you can get in there....). Worked out about €320 a month from what I recall...... great facility and I'm sure they are cleaning up.
hmmm.. 10 cubic feet is very small.. do you mean 10 feet cubed? (i.e = 1,000 cubic feet)
'U Store it', is that the big one which can be seen from the M50 motorway?.. if not there is one that can be seen just north of the toll bridge on the M50.
320 a month for 1,000 cubic feet seems expensive to me but maybe it's not, depends on the facilities I suppose....