Not an area I would seek to overnight personally - I seem to recall from previous enquiries that the IBIS in the town centre was suggested, with underground parking IIRC. Wherever, I wouldn't leave any gear on the bikes in these parts.
If you have a little extra time, why not try somewhere like Veurne, just a few clicks over the Belgian border (use booking.com) or even Ypres (Novotel) - both towns well worth a visit.