I've lived on the block for 5 years. Agree with most of the comments here. There are a few problem buildings that are getting better, although they are not there yet.
There has been some crime - I try not to deal drugs and usually have no issues. jk
I've walked around during many late hours (I'm female) and never felt threated or worried. Most nights it's absolutely quiet on the block. On a Saturday night in the summer, there is more likely to be people outside hanging out. I haven't had any problems with late night noise at all.
The access to public transit (buses and JSQ) is great. The architecture of those buildings are fantastic, and they have really invested in both buildings over the past couple of years. Lincoln Park is fantastic, as well as the local resources as mentioned. It's easy to park on the block (or within a block). Cab fare from JSQ is $4.50. There is more awareness than ever for McGinley Square and St.Peter's college is continually investing in the area as well. I've seen more new people on the block so I think the investment in the neighborhood is on the rise again. Good luck with your decision!

I live closer to Kennedy on Fairmount and have needed to walk at all different hours of the night and never had any challenges. Clearly the neighborhood is "in development" but even on Fairmount, there are 3 buildings that went condo in the past 2 years. I think it's a great neighborhood and I have enjoyed living there for the past 4 years.

newinnjjc - there are quite a few private lots for parking, I haven't seen too many garages.

I live one block over and I have never had a problem walking at night. (I'm a woman, if that's relevant to you.) I think McGinley is changing rapidly and it's kind of an exciting up and coming area. I guess you can tell my the number of posts that have popped up recently.

There are many condo projects, including two on the upper half of Fairmount that you should consider too (older buildings with some really nice details and decent space). It's true, the lower half of Fairmount often has people hanging outside - I walk up and down that block often and haven't had a problem.

It looks like they have also just started construction on the old parking ticket building between Montgomery and Fairmount too. It's supposed to be condos and retail space I believe.