Excellent location, close to market etc. Super clean and tidy, I was very comfortable during my stay there. I appreciated the kitchenette, which meant I could cook my own meals if I wanted to. Stairs are quite steep and narrow, which may be an issue for some, but Nora's son is able to help with luggage etc.
P.S I recommend a day trip to Tigre if you need a breath of fresh air and some 'green time'. Take the train from Retiro.