It's difficult to review the place - other than initial impressions - as I couldn't stay for the reserved period. Oscar had a couple of issues (a problem at work that detained him - he had to get his sister come to meet me) & the lock to the front door had broken on the day of my arrival.
He was organising a locksmith to visit but I didn't feel that I could stay in the meantime (I couldn't leave my laptop in an unlocked flat). He was very apologetic and arranged a full refund. Both he and his sister are lovely people and I can recommend them highly.
The location is great, rooftop facilities are fantastic, with a great view of the city and park opposite (I was perfectly happy waiting up there: there was even a place serving food/drinks).
Oscar is new to Airbnb and I'm sure these are teething problems: he knows that he needs a co-host/cleaner in place to deal with any such issues in future (he's a busy lawyer). Once these are sorted, this will be a great budget option in CDMX.