I had a look at 4 hotels as many are full on a Saturday night. Marine House was not, and I'm not surprised, frankly I don't understand where the good reviews come from.
I had a look at two room types, single and 'superior', though there was nothing superior about it. The deluxe rooms were full, so I can't comment about them.
Both rooms were awfully small and reminded me of Manhattan style tiny rooms. Looked modern and clean though. Furthermore the area of the hotel is rather busy and crowded, no island peacefulness.
If you don't mind the tiny size and downtown feeling, this place might be for you. Otherwise there are much more charming options. More