Hi Louise, 

Thanks for your question. 
 
For holiday lets we usually recommend our Origins Pocket 1500 or Origins Pocket Reflex 1000.
 
The Origins Pocket 1500 is a true medium feeling model giving that slight sink into the top layer but not too much. 
 
The Origins Pocket Reflex 1000 is slightly firmer in the top upholstery due to the construction with Reflex Foam. However, whilst it is firmer in the top layers we get a lot of feedback that it's very comfortable at the same time. The firmer upholstery also helps to accommodate a wider range of body weights. 
 
Zip and Link's are great for this use because they can subsequently be used together or independently. 
 

 
I hope this helps but if you have any further queries please don't hesitate to contact our office on 0161 437 4419.
 
Kind Regards, Lee.