Very nice place, in a a great location, but I think the reviews haven't quite depicted the place as accurately as I would like, if I was a prospective renter. First, the PROS:
Great location, on the border of Roma Norte and Condesa, right around the corner from a great restaurant, Lardo. Can't beat it.
Pretty spacious apartment, with plenty of room for four, with comfortable beds and big bedrooms. It's even bigger if you get access to the studio space, which is behind big beautiful glass doors. We didn't use it, but it's cool
Nice design touches throughout - nice graphic art and furnishings - she has really good taste.
Tania is super responsive - she'll get back to you right away and is cheerful, informed and really nice.
Kitchen is nice, with plenty of room to hang out or cook in. We didn't cook at all, but you could if you wanted.
She has filtered water available.
Very clean overall.
But I have to point out a few significant CONS as well:
The bathroom is nicely (sparsely) decorated, but there's a definite smell of mildew in the shower. Also, there's a lot of chipping paint and broken tiles on the windows, yes, that's to be expected in an old building but it's not that pleasant nonetheless. The shower water pressure is not good at all - the water drips out very slowly - so it was difficult to wash the shampoo out of your hair. It's decently clean overall, but with the mildew and the water pressure, it's just not a great shower overall. Kinda dreaded showering, to be honest.
The 2nd bathroom shower didn't have hot water, due to a problem in the apartment, so we don't know if that has good pressure or not. It's nice to have a 2nd bathroom though.
There are some noise issues in the two bedrooms, for a few reasons. First, both bedrooms look out over trees at eye level, which means you will hear lots and lots of birds, very early in the morning. Essentially, you are sleeping in a tree house! It's very nice, even kinda cool, if you're ok with the early birds, but it can be hard to sleep in. Secondly, a decent amount of noise from the street can be heard, especially on the weekends, so you might hear a few car alarms going off, etc. Bring earplugs if you're a sensitive sleeper.
A few other things that could use fixing is one of the front door locks to the apartment doesn't work, but the deadbolt one does. Also, the lobby entrance to the building doesn't work either. The front door lock DOES work though, so we felt pretty safe. (The area is safe, but it's good to know people can't get in.) Tania told us the plan was to get that fixed, but you might want to ask.
The lights in the hallway go on via motion-detection, but the top floor light is out, so you need to use your smartphone light to see in the dark and get the key in the door. A simple lightbulb should fix it, providing the fuse isn't out. But it's worth knowing that it's a bit of a pain.
It's a very nice apartment, clean and in a great location. IF the various shower issues were resolved it would make a huge difference. Definitely worth considering.