I believe both your questions can be answered by visiting Cruise Critic. If I guessed correctly and you're on the Holland America, Amsterdam, say, then choosing Amsterdam Deck 3: Lower Promenade Deck Plan, you'd see something like this:

Where HH is described as:

Large Outside Stateroom (fully obstructed views) (HH)

An alternative view is available on cruisedeckplans and you can hover over the cabin codes to bring up a description.

The cabin reviews that expedia refers to should be on the cruise critic reviews page.

I believe both your questions can be answered by visiting Cruise Critic. If I guessed correctly and you're on the Holland America, Amsterdam, say, then choosing Amsterdam Deck 3: Lower Promenade Deck Plan, you'd see something like this:

Where HH is described as:

Large Outside Stateroom (fully obstructed views) (HH)

An alternative view is available on cruisedeckplans and you can hover over the cabin codes to bring up a description.

The cabin reviews that expedia refers to should be on the cruise critic reviews page.