We were recommended to try this restaurant by one of our colleagues and well worth it, it was.
Dveri means doors in Russian, presumably the same in "local". We thought really it should have been called windows, as you can see from the photograph. It was dark when we arrived, but it seems we were sitting outside in a tiny entrance corridor, roofed over only by an awning at one end. The corridor had windows and window boxes from the neighbouring houses overlooking it, but the windows had mirror glass. Heating was provided by gas radiant pokers (for want of a better description), which appear as some of the lights in the photo. Anyway it was very cosy. I guess the tiny room inside must be very cosy in winter.
The food was also very good, as was the service. My Greek colleague had soup and I had home made creamy cheese (unfortunately pure cholesterol, so I couldn't eat it all). We were served home made bread, a sort of brioche which you tear pieces off. It looked so good, we had already grabbed bits before I thought to photograph it. Then I had grilled mixed vegetables and Nikos had some meat stew. Local wine and a beer made a bill of 25 Euros for us both. We didn't have room for desert.
Verdict: definitely worth a second visit.