I'd love to have a spare double bed, but we don't have space to have one as a permanent fixture - guests currently have to sleep on a double airbed which is okay for friends but not so good for the ageing in-laws etc. So what I am thinking about is buying one of those single beds with a trundle bed underneath that converts to a double. This will be for DD to use as a regular bed but it could then double up as a guest bed and when she is older could be sued for sleepovers etc (she will have to temporarily in with her sister on the odd occasion we have visitors). My question is - are the trundle bed thingies really any good? I have been looking at them online and am wondering if the trundle bed bits are hard to put up and possibly more trouble than they are worth? I want a nice wooden bedstead type one not a divan type one. Any thoughts oh wise ones?