Well, I guess this is kind of late now for you but maybe others are interested. I have traveled a couple of times with them (to dif destinations - France, Denmark etc.) and I never had problems with hand luggage (and I am the type of person that has always had over sized luggage

). The 5 kg limit is mostly informative, they rarely check it.
Anyhow, besides the 5kg bag you can have, free of charge (at ANY company as far as I know --- well except for traveling to UK --- I am not sure about that) a laptop bag, a purse, a camera, a book, an umbrella, a jacket etc. So enough I might say. Moreover, what I usually do if I need to carry extra hand luggage, I always go at checkin with a small bag and leave the other one(s) with the person accompanying me (if any). Once you do the checkin, nobody actually cares what bags you have... (that's a trick I've been using for a long time, but I try not to abuse it as it is not very nice when people have 100 bags and others cannot find space for their small ones... emergencies only

).
Hope you had a nice trip (oh, how I envy you for your holiday in Spain hehe)