A couple of ideas to add to the design.

Here we go then with the instructions for the "Love Heart"

Inflate the 260 leaving 6/7 fingers un-inflated.
On this one I made 4 finger fold twists but on the one above they were just 3 finger fold twists.
Decide what size you prefer and make six fold twists all the same size.

Inflate fully the Red 260 and tie in a knot. Make the 260 pretty firm as this will help with the shape of the heart later.
If you have an electric pump or one stroke floor pump the balloon will inflate really smooth with no ridges.

Attach this from the underside of the base.

Inflate the 160 Red and leave approx 6 fingers un-inflated.
Make two 1.5 finger pinch twists.

Make another 1 finger spacer bubble in the 160 and twist back into the 2 pinch twists,
this is to just make a stronger connection between the two loops.
Discard the rest of the 160 balloon.

You now need to twist the top section/middle of the heart back in on itself to form the heart shape.
To get the heart to sit nicely you do need to gently manipulate the 260 a little so you get the desired look.

The lower 160 loop is usually approx 3/4 fingers above the bottom of the centre of the heart.

Hope it worked out OK for you.
You can add to the heart with perhaps a little Teddy design or a Rose as I have above
especially as its coming up for Valentines day soon.