I've been to Kathmandu may times and eaten at Cafe Mitra before when it was in the old building adjacent to the road in Thamel. It has mow shrunk and retreated into the back garden. The food was always good, but pricey by Kathmandu standards but was worth it for special occasions. My wife and I visited in person to make a reservation 3 days before our last night in Kathmandu.
When we arrived at the appointed time a few hours before our flight home we were told that the restaurant had been reserved by a large group and there was no space for us. It seemed quite clear that the booking from a bigger group took precedence over us. Complaining bitterly I asked to speak to the owner who they said was not there and when I said 'phone him' they said he was not contactable (this is a country where everyone from the humblest trekking guide has a mobile phone to keep in touch).
So I really would suggest that you avoid this place. There are plenty of other restaurants in Kathmandu in this (expensive ex pat/NGO) category and find somewhere that will provide a decent service and not 'bump you' when they get a better offer.
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