I was here two years ago. It opened only after the restoration. It looks small from the outside. And inside it is huge in three floors. Boats and speedboats are on display and not at all crowded . Very interesting exhibits from different times. Stories about the naval battles of the past centuries
The museum is small, but it is worth visiting to get an idea of the boats of the sultans. They are very beautiful and elegant. There is an exhibition dedicated to diving equipment
A great way to combine a boat trip with a visit to the sights. You can get to the center, to the mosques of Sultanahmet, and to the Asian part-shopping, hot and noisy, and to the Prince's Islands, if there is a fuse to relax and swim. Nearby is a maritime museum with an excellent exposition, a cafe and a toilet, respectively. Personally, I prefer not to explore Istanbul's urban transport in good weather, but to enjoy the water! They wear tea, coffee and juices, the views are luxurious, I recommend it!