My garden is 70 ft wide x 40 ft deep from the back of the house. Is that a good size for a town/suburban garden. Five bed house the width of the garden. Had an estate agent out to value and he said the depth is an issue. It's almost half lawn half terrace. Green slate it's really nice. I was taken aback by what he said. For context, in the suburbs of a large town in the southeast. What do you think?