We have been in forward cabins and never had a problem. Sailed the Sun Princess and had a cabin on the Riviera deck (same deck as the pool) It is a smaller ship, however. But an older ship. We have never felt any movement even being that high up on the ship. In 2004 we sailed the Grand Princess and had an oceanview at the very back of the ship. Our portal looked directly out back. The Grand is a large ship, and we never had movement on it either. Of course, if you have rough seas, you're going to feel something, but the stabilizers on the ship helps keep that movement down some. So, don't fret. Everything should be fine.