My previous dog was a shep/husky mix and we started out with him in an apartment (although he was 2 when adopted, not a puppy). He did just fine in the apartment, luckily we lived near a large park with trails and with an off leash area so he got lots of exercise. I suppose the big difference is you have to commit to going out with the dog and since you don't have a "backyard" to default to. You have to get up, get dressed and do your walks rain, shine, middle of the night. Nothing wrong with that. In fact you may find you both benefit from that instead of defaulting to the backyard. The only time the apartment/dog life was tough was when the dog got into some garbage and had diarrhea with a need to go out a lot. Then it was kind of a pain to not have a convenient backyard. If any dog gets the right amount of exercise, I'm a believer that any dog will do fine living in an apartment. It is up to the human to ensure the exercise happens like clockwork.
As far as what to expect from that mix, shedding lots of shedding. Get a furminator now and expect to do a lot of brushing. Also ours got hot during the summer and didn't want to do much in the heat. He didn't like water, which would have been a big help. I would try to get your pup interested in water (kiddie pool, streams, etc) so you can help him cool off.
Personality wise, who knows if you will end up with more shepherd traits or husky traits. A lot will depend on you, training and socializing. Our was a gentle giant, observant, but not aggressive. Very good and patient with kids. He liked to sing for his super like husky's do, but was otherwise not a barker.
Best wishes on the new pup.