As other comments say, the neighborhood isn't the most beautiful, but it's close to a metro station and several bus stops, and we never felt unsafe (warning: we're from Colombia, so our "feeling safe" range might be wider than yours), it's just the streets are a bit dirty and the building is old but people on the street didn't bother us or tried to steal from us or hurt us in any way. So it's really just an old neighborhood that's not super clean and that's it. If you're used to super clean cities, it might shock you. But if you don't care, you can look past it, besides if you're a tourist you'll spend your days in the sights and you'll only be coming back to sleep at night. The only "problem" with the location was that some nights there was really loud music from the neighbors, so that wasn't nice. I'd recommend bringing earplugs or headphones to put in some sleeping music or podcast if the neighbors decide to party again. The apartment is quite small but if it's 1 or 2 people it's perfect. We were out most of the time anyway and location near transportation and a cheap parking lot (12eur for over 6 hours) was very useful. Communication with Nelly and Nick was super easy!