Booking Amelia's apartment, I honestly was a bit nervous it was a scam because it seemed too good to be true. It's not, and it's a beautiful apartment, with a view just like in the pictures!
We have a 10 month old baby so we were looking for somewhere walking distance to most of the places we wanted to go so we wouldn't need to worry about a car seat, and also somewhere safe. This place offered both of those things. With 24 hour very friendly security guards, this building is very secure. And it's right by Chapultepec park, 20 mins walk into Roma or Reforma. Tons of places to eat nearby (I particularly recommend Delicia - Panadería Artesanal which is right round the corner, amazing coffee and yummy pastries and friendly staff).
We were able to check in early both times (around 11.30am) which was amazing. Check in is very easy, since the security guards give you the key, so you don't have to worry about meeting the host at a certain time, or that someone won't be there to let you in. The apartment was sparkling clean, in fact the second time (we stayed here for almost a week, then left for a week, then came back for 1 night) a guy was just finishing washing the balcony and the big patio windows, not sure if they do that between every guest, but must be fairly often.
Amelia was also really thoughtful about our baby, and left a basket of toys, a highchair, a pack n play and a little baby bath since they only have a shower (big enough for our 10 month old). Because we spend a week in the neighbouring state and then came back, she even lent us that little bathtub for the week we were away.
Another time I might prefer to be a bit deeper into Condesa or perhaps in Roma Norte (basically further east), just because this apartment is located right on a busy motorway and feels kind of right on the edge of the neighbourhood, instead of within it. Would have been slightly better for many food options, and hopefully less traffic noise, fewer sirens and maybe a bit less light. They do have blackout blinds, but lots of light comes in around the edges which did disturb our baby. There's nothing they can do about this really, it's just something to note if you're sensitive to light when sleeping.
Overall, you can't go wrong with this place, it's a win on so many fronts.