Hi,
If you look for Maxwellton Road, Paisley on Google Maps, you'll see that it has undergone extensive modernisation and that there is now a school in the area where your ancestors used to live. However, if you move along the road to nos. 50, 52 and 54, you'll see the types of cottages and tenements that used to line the road. At least it gives you some idea of what the area used to look like.
I haven't lived in Paisley for several decades but, as I remember, the Coates factories were behind the Watermill Hotel on the River Cart, not on or near Maxwellton Road.
Hope this helps.
Happy hunting
Angela