We recently stayed at Gregorie's studio.
We didn't get to see him but we were welcomed by a very nice Lady. Her name is Dior and she was very helpful and knowledgeable of Paris.
The studio is located very near the Republic subway which is very well connected with other stations. There are also many bars and restaurants in the area that are more for locals. We liked that.
The apartment itself is very small but it perfectly suits a couple :)
We thought the location and the price of the place were perfect for us. We would definitely book here again.