They were about 5 feet and 5 inches tall. They were really
strong. Even more strong than modern humans.
They are thought to have been 166 to 171 cm (about 5'5" to 5'7") tall.
Neanderthal wasn't a mere person, it was the name given to the Human Race before they'd gained any concept of civilization. Like today, there is far from a fixed height for the Neanderthals.