This is coming from a couple who met and lived in New York City - so we are accustomed to living in noisy surroundings. It was very difficult to get a good night's sleep. The two rooms in front are right on a busy sleep. On a Saturday night there was loud partying and drinking (and arguments, singing - you name it) until 4am. On the the other nights, there were street sweepers, another machine to power wash the street and sidewalks, it was so loud. In the master bedroom in the back of the apartment, a neighbor plays their guitar into the early hours of the morning. Also, if the neighbor above you turns on their kitchen lihgt, it shines a very (very) bright light into the master bedroom.
The owners really did themselves a disfavor by not purchasing blackout shades (in all of the bedrooms) and also cheaping out on the windows on the street side bedrooms (need sound proof windows).
I would recommend an eye mask, ear plugs, and a white noise app on your phone.