basements are way better than above ground. more temperate making them easier to heat and cool (or tough it out). less electronic radiation overall. plus, will shield from intense sources like new energy weapons or the sun and its environs.
mitigate the moisture and biology with a dehumidifier and spreading plenty of boron around. use boron to shampoo carpets and scrub floors and bathrooms. it will keep mold and mildew at bay and whiten porcelain. it will kill cockroaches and scorpions and spiders and keep most creepy crawlies at bay. sprinkle a little under sinks, behind toilets and around the refrigerator. i use it in my fridge, too, to prevent mildew.
do not store anything directly on the floor. if the place starts to flood you can move things out before they get wet.
make sure your bedrooms have proper windows for ingress and egress because there is usually only one door in and out.
if the carpet is green shag its been there since the 70s.