A few thoughts.

This kind of advertising may also attract other people, not just those who want to isolate themselves. It's a health risk.

A hotel holiday and use of hotel services such as restaurants, swimming pools and saunas aren’t the most sensible option in this situation.

Those who need to self-isolate themselves probably understand contacting hotels directly if they want to use hotels for the isolation.

Why the hotel has to advertise the isolation by marketing bay views? What does it have to do with the isolation? Feels like it belittles the ongoing crisis.