Can anybody recommend a mattress? I have seen Simba advertised, Emma, and I am a bit confused. I don't think I fancy a memory foam one, it sounds a bit flimsy, I prefer something with springs. I don't want it to be like a pair of trainers. Also I have back issues so I need something firm(ish) but would like it not to be like sleeping on a plank of wood. I don't know where to begin. Thank you.