I booked this for my friends and I as a stop-over when we went to see a show at the o2.
The guest house was not the easiest to get to due to the lefts and rights and avoiding various roadworks on the North Circular but there is non-restricted parking in most of the streets on and around Rosebery Avenue and we were lucky enough to park outside the front door. We had to inform the owner of our arrival as there are no staff "on-site" except when teh cleaner is working. Although the wait was a mild inconvenience is wasn't a deal breaker by any means. Simple directions gave us less than a 10 minute walk to Tottenham Hale tube station (Jubilee line) - 25-30 minutes from central London (Green Park / Leicester Square, etc.)