You don't say where you are flying from, if its Gatwick you may be OK. We have had several short breaks of between 3 and 5 days, when we were buying our apartment, and last year when we packed it up for the winter. I've just had a look on
INVALID URL and there are some in May - you get the option to enter a number of nights in the search, I entered 4. There are also some in May on
http://www.xl.com for 4 nights. Would have suggested Thomas Cook as you book the outgoing and return individually, but from what I have read on this forum this year, they are cancelling flights all over the place, so may not be such a good choice this year. Good luck, hope you find something and have a lovely time!