We went as a family of three, our daughter just 3 years old. The place was clean and you can feel whoever lives there really tries to take good care of things. The Host was quick to respond
Expect to be taking the bus to stations, once you are at the station though, it's pretty easy to get anywhere.
Seven sisters is a multi-cultural area, you will find shops around the station catered towards Nigerians and other North African countries. We were there for just over a week, never felt unsafe walking back with our kid from the station.
Oh yes, if this is the first time you are in England / Europe, remember the water coming out of the hot tap is seriously hot!