From your description it sounds like a good move especially with a garden, but think carefully about the differences in lifestyle when living in close proximity to your neighbours and no privacy outdoors.
Noise from neighbours, complaints from neighbours about reasonable noise, washing machines, toilets flushing at night, smokers, dogs, children, sex noises, overhearing arguments, sharing a garden space for hanging washing, BBQs, toys, playing, supervising children while in garden are all common complaints on MNetters in flats and unfortunately you cant choose your neighbours which is why most people try to move from a flat to a house to a detached house where possible to get that little bit more space and privacy.
You could move into brilliant NDNs but within a year have new ones which like sitting outside your children's bedroom window until late in the evening chatting.
My dsis moved to a modern new build semi and the sound proofing was terrible, when she or her dh were in the house alone she felt there was someone else in the same house, especially when the NDN dc ran up and down the stairs or there washing machine/tumble dryer was running in the evenings. She moved out, losing money, within 2 years as she was very sensitive to the noises, you and your children might not be as noise sensitive but certainly worth careful consideration before making a decision.