I just looked at a bunch of homes in the Como area - closing on one soon. I looked at a house on Simon, just west of Dale. The street itself seemed OK to me, but a few blocks south looked a little sketchier. I decided I would have to visit the neighborhood a few times before deciding to make an offer on the house I looked at. Walk around the neighborhood for a while at different times of the day - make sure one of the times is dusk. I would also recommend talking to any residents of the area you run across while walking and asking them about the neighborhood.
The St. Paul Police Department also publishes great crime maps that break crime in to several categories. The maps are color coded and shade each 6-10 block area different colors to make it easy to compare. Take a look at the maps for the past couple of years for the area you're moving into and see if the area your house is in is getting better, worse, or staying the same.
SaintPaul Police Department