Chris is a great guy and a great host. The flat is very close to Kings Cross Station and therefore a great location because a lot of tube lines are there. Check in went very smoothly.
There are two code locks for the flat and your room. For saftey reasons they are disabled for ~10 minutes if you enter the wrong combination so be careful not to enter the correct code! But the area seemed very safe to us so there is no need to worry. All in all i recommend staying here.