The casa mini is not nearly as small as it sounds. It is on two levels, with a good- size lounge/kitchen/eating area on the ground floor and a nice, air-conditioned bedroom and bathroom in the attic (so watch your head). There is also a small balcony with hills views. The place is very well equipped, almost as if someone is living there permanently. The location is almost perfect, off a tree-lined street within easy walking distance from the beautiful central square and surrounding restaurants, etc.
Thank you Silke for picking me up from the bus station and providing helpful local info. The only issue I had was with the weak Wifi signal (which appears to be a general problem in Soller) but I am sure that can be fairy readily fixed.