Igor and Ana's place is in a good location that is easily walkable and accessible to the metro. There is a slight incline up to their apartment from the closest metro but it's a short walk, maybe 5 minutes. The closest metro was closed when we stayed there this month (July 2018) so hopefully it'll be open by the time you arrive. There was also a little bit of construction going on outside so there was some noice; hopefully that'll also be done by the time you book their place. We do recommend it as a nice, comfortable stay.
The apartment is well kept, bathroom is clean and mostly with white accents and a large window, so it feels serene. The balcony has a small patio set where you can enjoy a coffee/tea break or have a meal. You would be sharing the bathroom with four other rooms so keep that in mind; however, it was easy to share since it was empty most of the time. Us travelers are too busy sightseeing to be indoors!
We did have issues accessing wifi from our phones but hopefully that was just a fluke and you will have no issues. We were able to access wifi from our laptop just fine.
Overall, we had a nice stay and would recommend it.