We have been lucky with the Poseidon and always had good weather so never experienced the 3 hour trip. We love the way the Captain comes on board looking so immaculate in his crisp whites just like the Captain of the Q.E.2. We often say what an effort he makes and how good he looks, he really takes a pride in his job.
Poppy, look up the Mango Rooms on Tripadvisor.com seems it is advertised under "Hostels" and there is a problem with the showers in the rooms being over the toilets. However, it seems, in general, to get good write-ups. We always stay in the same Hotel in Rhodes which we keep a state secret as it's so lovely we don't want the world to know about it, so they will always have space for us.
Jacqui.