"Overall, a nice place to live, but you have to pay attention to the neighborhood"
Riverside is a great shortcut or a great way to avoid Broadway. You can time the lights from 72nd street to about 168th street and can go through 3 or 4 before you have to stop. And these lights are not at every block. From about 120th to 135th there are no lights at all since you are traveling on the overpass/aquaduct. Along Riverside, there are no businesses, restaurants, or delivery trucks. It is only passenger cars, and bikes. It is a pretty tree-lined street with great looking apartments. However, near 134th street there are some warehouses & at 135-140 many drug dealers are still around, so avoid walking there. Up towards Columbia Medical Center - it is fine to walk - very safe. And of course, down by Columbia University - it is also safe to walk. At 108th street there is a nice entrance to the park.