I recently stayed at Martin's studio for almost 2 weeks and found it to be an ideal base in Buenos Aires. It's close to the centre, walking distance to the Obelisk, and only a few blocks walk from all the subte lines.
The apartment is exactly as it is shown in the photos, it's spacious and airy, everything works, and Martin said I could just ask him for anything else I needed. My only issue whilst there was that the pool hadn't been cleaned in a while but as soon as I mentioned it to Martin he got in touch with the building maintenance and within a couple of days it had been cleaned.
Martin himself was extremely helpful. I booked the propertly at very short notice and Martin had to rearrange his work schedule to be able to meet me at the time I was going to be arriving, much appreciated!
I would defintely stay here again.