I have just been on atlantica , the slide is open but the staff had to supervise it and opening hours were limited to one hour per day.
The ship is getting over teething troubles there were quite a few workers onboard correcting faults as the ship was preparing to leave europe for the states and they were concerned about the cdc inspections.
The pools were too cold and the hot tubs not warm enough.
Many cabin doors and balcony doors were stiff.
In general the ship is a treat, everything is patterned, lots of mosaic tiles and marketry. The atrium is stunning and at the top a glass floor joins the top two floors so dont look down!!