I agree Saint Johns is nice area but you have to be careful which Saint Johns you are renting.The golden rule here is Saint Johns Wood on the village side is fine but you need to be careful if you rent in the Sruleen , Greenpark, Saint Johns Park West area. I rented for a while in Saint Johns Wood and I had no problems, but my college friend rented in Saint Johns Park West and she had terrible trouble with local youths on the road. She spent more time locked in her room than she did anywhere else in the house. She moved before her rental agreement expired, stayed with me and my flat mates for a while and later moved to Monastery Road for the duration of her studies with no problems. Hope this helps you.