Doing a Master’s in aerospace engineering has several positive aspects, from the highly distinguished and competitive environment to the highly international student bodies. From an academic standpoint, the program is top-notch and is sure to guarantee extremely good professional opportunities later in life. The professors are sometimes more researchers than professors, and this can impact a bit the teaching quality.
The student life in Delft is also very developed, offering several different opportunities for personal growth.
The main drawback really is just the logistics: finding a house in Delft, whether through the university or privately, is sure to turn into an expensive nightmare if the process is not started early enough. I would recommend starting the accommodation search at least a couple of months before.