I recently bought 2 of these ARMARKAT cat beds, and as soon as I put one on the floor, my two five month old cats moved right in... (I've saved one the beds for later)  
My cats sleep in their bed everyday, usually curling up together.  There's plenty of room for both cats and I feel the beds could accommodate two regular sized adult cats pretty well since they always like to snuggle.    
These beds are quality made and are actually quite attractive.... and are VERY soft and cozy.   They look nice sitting in our living spaces, which I'm picky about, and I don't mind having them in view at all !
I'm really very happy with this purchase and would highly recommend the ARMARKAT Cat Bed!