Just put Ace Cafe in to google maps!
Otherwise, here's a full address:
Ace Corner N Circular Rd, London NW10 7UD
Which I found via google by the way. Which it took me far less time to find and copy paste than to write this post. Not that I'm suggesting you could have quickly googled it of course.. That's why I'm here !
Tongue firmly in cheek in case you were wondering