I spent 7 nights at Grady's studio and I was overall happy! First of all the place was very clean, particularly the bathroom, where I also found several clean towels. I was honestly a bit scare of the sofa-bed, but at the end it was very comfortable. The fridge and the the A/C conditioner condenser (I think this is what it was!) of the neighbor (which is outside the studio, in front of the entrance) were a bit loud during the night...but acceptable! The studio is in a very quite and safe neighborhood, which is just 2 blocks away from St Charles Avenue, where the street car stops by. It was very convenient and I was able to reach the convention center in 10/15 minutes by street car + 10 minutes on foot, which was perfect! The Garden District area is just lovely and all the touristic attractions are easily reachable on-foot or by street car. The studio is small but suitable for one/two persons and it provided more than what it's written: hair dryer and iron were also there!
I would recommend the place! Finally, I did not have the chance to meet Grady, but he was always reachable by e-mail and he was also flexible with check-in and check-out times.
Thanks Grady!