Roses don't grow well indoors, as mike_rivers said. These roses are intended to be more like a cut flower--they bloom and then you throw them out. Now, that's not what we usually do with them, but that's the idea behind plants like this. They are green house grown very quckly to a small uniform size, fed heavily to make them bloom, and then sold at the supermarket or big box store as gifts. It's not that you are doing anything wrong, its that they have had absolutely perfect controlled temperature, humidity, lighting, water, fertilizer, and pesticides to make them look perfect. Now they are in the real world and they are having to deal with it for the first time in their little lives. You can plant them in a pot outdoors (there are often 4-6 individual plants in the single container) or in the ground. They won't survive indoors. They may or may not be good in the garden--some are very good, others are terrible.

Yes! It IS a problem...called mealy bugs! Check all plants in the vicinity-as they may all have them. If you have rubbing alcohol, use a 50/50 mixture of it & water in a spray bottle. You can first dip Q-tip swabs (or use toothpicks-to scrape off) & then spray. They like to hide in the cracks of the leaves. If you take one of those cottony things & squish it, you'll see brown stuff (dead bug). You want to remove all the white, cottony, sticky stuff. After you've sprayed ~check every day~ reapply if necessary. Quarantine from other plants ~if the others don't seem infected by them. On the other hand, if you don't have rubbing alcohol & can't get any, use the swabs (or whatever) & then spray with a dish soap mixture (w/water).

Unfortunately, 'decent' light is not enough. As already pointed out, full sun for min. 6hrs is what it needs. But it's winter & we 'up north' have to give succulents some extra light. Sunniest window possible, close to it so plant gets as much natural light as available and it would be good to add some supplemental lighting. It would help to turn the pot 1/4 turn every week or so to expose all sides to light source (& it won't grow leaning to one side). The pot looks huge & it is very easy to overwater plant in so much soil. If handling, try not to rub/touch the leaves too much. It will rub off that nice 'powder' (a.k.a. bloom or pruinose) on surface. This post was edited by rina_ on Fri, Jan 16, 15 at 23:41

So many leaves falling off and stalk damaged like that - I would suspect overwatering. There is always bigger chance of overwatering if using water retaining soil. If the plant is potted in fast draining mix and a container with drainage hole (is there one?) will diminish that chance considerably. That would be better way of not overwatering than using ice cubes :) What is the light and temps like where the plant is kept?