I had a pleasant stay at the flat which is located in a lovely part of Buenos Aires. I was at the flat for 2 months while studying and found it had everything I needed to make my time there comfortable. Esteban was very helpful in particular and he was easy to get in touch with if I needed any help with issues regarding the flat.
Light is a problem, however, and for me personally, I did find it a little difficult to study as there is not so much sunlight that gets in. On the other hand, as a base to explore and visit places in and around Belgrano or the centre, I would say the flat represents good value and I am sure you would enjoy your stay.