@AliciaWhiskers
Don't do it!
I grew up in a big house - 4 bed, very roomy, massive garden (like front, back and side made a quarter acre.) It was one of the 1940's council houses like first pic.
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I absolutely loved it, all the room in the house, the huge attic, and the big garden where my dad put swings and slides and things to play on for us kids... I lived there til my early 20's when I moved into a flat with my boyfriend (now DH.) It was a cosy 1 bed on the top floor (3 storeys like 2nd pic.)
We loved having our own place, it was cheap, it had a secure tenancy (as it was housing association,) and it was close to the shops, bus stop, train station, and doctors etc.
However, after about a year, I started to realise I HATED having no garden. We didn't even have kids, OR pets. (Though I really wanted a cat or dog but the HA wouldn't allow it. Plus it was dangerous for cats as the block was on a B road!) But I still hated having no garden.
The more time wore on, and the more I visited my folks, DH's family, and our friends (who all had houses with gardens,) the more I hated not having one. Nowhere to sunbathe and chill with a book, nowhere private to hang my washing, (only 3 communal lines that you couldn't see from the flat windows,) nowhere to put my bike or tools etc, and nowhere to put a shed.
Also, we had to park our car 2-3 minutes walk away where we couldn't see it, on a public car park! I know these seem like trivial reasons to several people on here, but nothing is 'trivial' if it bothers you.
We bought a house (with a back garden AND a front garden, and a driveway and garage,) a couple of years after moving into our flat, and would never go back. As for people saying 'oooh, allright if you can afford it!' that's nonsense. In many areas, you can get a house for a similar price to a flat.
With children, there is no way in hell I would live in a flat if I had a choice. No, not even a ground floor one. Some G/F ones have a garden and somewhere to put things like a shed and your bikes and so on, but where I live, many people with G/F flats (who are renting) don't have their own individual, private back garden.(Or front!)
Seriously, don't do it. Not with 2 kids especially!!!