competent, caring, warm, patient staff. (Best to call them directly rather than emailing for information/clarifications etc.)
SATT restaurant on site quite marvelous. Breakfast, lunch, weekend brunch, and dinner buffets quite sumptuous. (Expensive, but all food in Iceland is.) A la carte available. Restaurant was very comfortable centerpoint of our activities there.
Didn't explore spa until we were checking out and wish we had done so earlier (salt water pool, hot tub, sauna, and nice atmosphere just to lounge -- maybe $20/day extra? other spa services available for fee).
We were there during winter, so took taxi (or else shuttle services from pre-purchased tours) everywhere. Taxis almost immediately available.
Perlan museum is 5 minute drive away and extremely worthwhile experience orienting to the Icelandic geography/geology/history, many experiential exhibits, exquisitely designed with 360 degree panorama restaurant on top of museum.