You might check out Ball Cactus (Parodia magnifica)
which your photo makes calls to my mind. Also the description of soft spines matches.
As for the remainder, if it is going to be an indoor plant year round, give it as much sunlight as you can. Most of my cacti like a lot of it. Even those that protest when the harsh sun here gets to be too much when it's hitting them directly like a lot of light. Those tend to get reduced hours in direct sunlight and really bright filtered shade where direct sun is sporadic. I'm not sure how lack of light might effect the bloom cycle.
