The Rancho Arroyo area homes have much bigger lots with bigger homes, and they are older too, but still nice.
The one thing that Niles has over other areas is the sense of community. Whether it is the shops on Main street, Mr. Mikey's grocery store (one of the nicest I have seen for a small store) to the new Niles park, NCLL (Niles Centerville Little League) or just the neighbors you meet there, it is unique not only to Fremont, but to just about any city in the Bay Area. Niles Elementary is one of the jewels for any schools and the teachers are great, with lots of personalized attention.
Many of the older homes are being fixed up and remodeled as well. Although it is tucked away, it has really won my heart over and I just love it there. Come on down anytime - you will love it.