Make sure you do an inventory yourself. Or, if they've done one, double check it and add to it. I tend to take photos of any slight thing that could possibly be considered a fault (so if there's a crack in a bathroom tile, a stain on the carpet) to make sure it's documented as being there when I moved in.
Does your lease allow for a rolling month by month period after the 6 months? The renovation may take longer than you think.
It seems unlikely that they'll change the decor if you're happy being a tenant as is, so if you do want something changed ask for it before you sign anything. If you're renting it furnished, make sure to ask if there's any furniture you don't want to be there. If you want it unfurnished, make sure they actually supply it unfurnished!
You'll only need contents insurance, and that tends to come out a bit cheaper if there is window locks, I've always asked for them to be fitted if they're not there already.
They'll probably sort out the gas electric etc, but it's worth checking. You'll most likely be the one that has to sort it out at the end (i.e. making sure they all know when you're moving out and settling the final bill).
Know who you're to contact if there are any problems - is it them or a letting agency? Do a basic check to make sure everything is working when you first move in: hob, oven, grill, shower, central heating (you might need it six months from now!)