The neighborhood where I grew up was the sort of place in which people dream of raising children–a small but satisfying spread of center-halI colonials, old roses, and quiet roads.
I don't understand the latter half of the sentence.
'Center-hall colonial' is a style of architecture. The house is rectangular, with the long side facing the street or road. The front door opens into a small hallway with a stairway to the second floor straight ahead and doors to the left and right to, probably, the kitchen on one side and the living room on the other. Here are some examples of the original type and here is a modern one.
'small but satisfying spread' = the houses are not packed in tightly, and the area is bigger than just a block or two.
'Old roses' = old rose bushes