Hey Owen, congratulations on your new home. Few teething problems I see.
The smell might have seeped right into the cement screed under the sink area. If it doesn't go away you might be as well off to break out that piece and re lay it.
Get the area dried out completely and work out if you have a damp problem. Are you sure the smell is not coming in from a drain outside? I think I see the sink overflow externally is going right down to the drain outside. Get on your knees and stick your nose down to that drain.
The smell might have seeped right into the cement screed under the sink area. If it doesn't go away you might be as well off to break out that piece and re lay it.
Get the area dried out completely and work out if you have a damp problem. Are you sure the smell is not coming in from a drain outside? I think I see the sink overflow externally is going right down to the drain outside. Get on your knees and stick your nose down to that drain.