Easy and convenient. W6 hotel is a 10 min walk from Hammersmith station, with the Eventim Apollo also not far away.
They ask you to take a pic of your luggage so you can show them it on your return and they grab it for you from the secure storage.
£6 is much cheaper than the £15 I would’ve spent taking the tubes to my partner’s to dump it and come back and go again otherwise!