Emma:
3 nights and 3 full days (the plane arrives a 7:00).
I asked them about the possibility to choose a room with fewer beds and/or ensuite on their website. Booking with them provides better rates, but offers no options to choose other than gender.
Ken:
I had already booked on Hostelworld and paid a deposit (that I couldn't get back If I canceled) but thanks for the info. Not long after the booking Mar-Mar replied to my inquiry with the following message:
"Hello, If you would like to instantly book a dorm bed, please go to www.hostelworld.com (search for Cinque Terre and Mar-Mar).
,IIf you prefer to book directly with us via email, please keep in mind that while we message one another back and forth it is possible that someone will instantly book the property on the Hostelworld website, thus rendering the apartment no longer available.
We have one large mixed sex dormitory for students and budget travelers. The dorm is actually a very large apartment that sleeps ten persons and is composed of a sit-in kitchen, two bathrooms (each with a shower), the main room (where there are five single beds), a room with three single beds, another room with two single beds, and a terrace with nice village views. The price per night is 30,00 euro per person (breakfast included). Please note: We do not have a curfew or lock-out time. However, we do ask that you keep noise to a minimum and that you are respectful of your neighbors and fellow travelers.If you would like to instantly book a dorm bed, please go to www.hostelworld.com (search for Cinque Terre and Mar-Mar). Ciao Mario"
So in the end it was probably a good thing I didn't wait for their reply. Rates and room options are exactly the same.
I did book directly with all the hotels except Mr. Rome, which didn't offer such option, and of course Mar Mar for reasons already stated.
Only London left! Thank you all very much!