Bucharest sector 6

Hi, I am moving to Bucharest for 1 month and I have a question. I was looking for a place about 30-40m2 with budget about 350-400 euro. I noticed that every apartment I liked was plaed in sector 6, what is more in Militari. I wanted to ask, why is that? Also wanted to ask if https://www.imobiliare.ro/oferta/garsoniera-de-inchiriat-sector-6-militari-mobilata-36-mp-1-240849677 announcements like this seems legit? I am just wondering why in other sectors places for 300 euro looks so horrible comparing to sector 6