I stayed for 11 nights during a conference and some extra days. Viviana and her family were really nice and welcoming. Her parent's English is limited, but we could communicate. The room was as advertised, very clean and neat. I was even allowed to wash a load of laundry, but that was not in the advertisement and should be therefore not be seen as a given in the future, the same as a few excellent meals I was invited to. The size of the bed is standard and was just enough for me, but if you are taller than 1.90 m (6' 2) you won't be able to sleep stretched out.
Speaking as a naive, male European, I never felt unsafe in the neighborhood. Everything you could want is available and a subway station with good connections is only a couple of houses down the street.
All in all I had a very nice stay and would definitely come back.