I highly recommend the Coffee Inn. This site's description of this cafe pretty much sums up how cosy and friendly the place is, and it really is cosy and friendly. The interior decoration makes you feel relaxed, and, more importantly, the staff are without exception ever so friendly and efficient. I live nearby and have been to this place a countless number of times, sometimes for coffee in the afternoon but more often for a meal in the evening.
What I especially recommend is their pasta dishes, which are incredibly super for their prices. I have paid more at other places so many times, only to be disappointed quite often. I have covered virtually all cafes in NW3 and can say with confidence that the Coffee Inn is not only the most reasonably priced but also is the place where you can have the best quality pasta around here. The chefs are simply so talented. Also, the portion is so generous you won't believe! Order anything, pasta, jacket potatoes, or steaks...you will be amazed how much minute care is taken to make sure any of them taste just so right. If you want to round up your meal with a nice dessert and coffee, there again, they always deliver. Meal or coffee, they haven't even once failed to live up to my rather difficult expectations.
They close at 9.00pm. I think that is when the last orders are taken. So you'd have to get there early enough. But once you are there, you feel at home, as they never rush you. If you are on your own, the staff will keep you company with a friendly chat. What more could you wish? The food is just excellent, no matter what you order, and, in the department of service, too, they always give you the very best of service.