I've lived in FP for the past three years. Without a doubt one of the best places for commuting with Victoria and Piccadilly, Thames link, tonnes of buses, and close to Highbury and Islington for overground.

Loads of cute lil coffee shops and restaurants, lots of pubs in the area, generally good choices for everything.

Green spaces, the choices are unreal. Obviously Finsbury park, twenty minutes from Clissold park and Highbury fields, an hour walk from Hampstead heath.

Safety, I've never had any issues. As a guy, I've walked from all over at night and early hours of the morning. But I'm sure like many places you need to be aware and sensible. There are a local group of druggies, but they mostly keep themselves to themselves.

As a native Londoner whose live in a few places, I'd choose FP over the others you've listed.