First, the apartment: probably the best flat you'll find for such a price in Rome. Very spacious, bright and tidy, with large rooms. Lots of storage space, comfortable bed, stylish bathroom, convenient kitchen and a nice TV set.
Now, the location: a little out of the way when it comes to experiencing the city, and you should not think that it is close to Tiburtina. It is a 15-20 minute walk alongside heavy road traffic, so unless you have very light luggage you'll have to take a taxi. And to get to the city centre you'll end up having to take a bus, because the area around Via Tiburtina is not necessarily pleasant to walk.