I think the second floor is better than the first floor. You get less traffic as people get to their respective floors and a better view. You also get additional stairs that you can use for exercise while going up and down the stairs.
2nd floor is better, its just more difficult to move the furniture into. If you think you might be there a while its worth it. If your only going to be there a month or two I would just stay on the bottom.
Highest floor on building is very safe ,noone will jump or wAlk their and if u hv kids better to stay on ground floor ,kids never stay on same place and making noice people will complain about u if they do this so ground floor with kids n upper floor when u dnt hv kids .