Ilse is a very nice and helpful host. She had made a little guide to the neighborhood which we used a lot and had bought bread and eggs for us as we arrived late with a toddler. The apartment is in a prime location in lovely Roma Norte.
However, the apartment is on a ground floor and there is no day light in winter and it was way too cold to use the patios (due to the lack of daylight, I'm sure it's nice in summer). This also made it quite chilly (we had some electric heaters which helped, but still, it wasn't that nice). It's charming but quite worn down and not really functional, eg. the door between the bathroom and second bedroom couldn't close and there is no storage place or hangers at all. There was no hot water in the kitchen during our entire stay so we had to boil water to do the dishes. And the kitchen equipment wasn't clean upon arrival, so we washed everything before using it. We also purchased new sponges because the old ones were dirty (we also rent out our home when we travel and always make sure to leave new sponges for new guests).
The apartment is fine for a couple of days if you're out all day. But if you come as a family, like us, and want to spend some time at home as well then I wouldn't recommend and we actually changed to another place 4 days earlier than planned. So it depends on your needs.