As in all cities, there are good and bad areas. Just driving through Hwy 27 is not a complete picture.
Leesburg wraps around Lake Harris, and the main two highways are 27 and 441, which join in the northern part of Leesburg. Hwy 441 is much nicer, although there are almost no areas in Leesburg I'd be afraid to walk.
Some parts of Hwy 27 are a bit run down, but other areas are fine. Between the two highways is Main Street, which has a nice downtown.
Leesburg has many pluses; a new Library, Venetian Gardens, great hospital, etc,etc. As a previous poster stated, it also has a large retired population


because of the many nice upscale 55+ communities in the Area, like Legacy, Arlington Ridge, The Plantation, etc.
Google the address you are being offered, and see a video of the streets around it, etc. Better yet, visit there yourself and decide. You do not say what employment you are after, or what skills you may have. Jobs are tough, so it is best to visit first WITHOUT moving to check out the area and to look for work. It is best to secure work before you move.
Good luck..........(from one of those 51 year old "Old People" mentioned above

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Frank