Was disappointed with Bratislava. There is an ok old town, the castle is worth a look and there are nice spots to walk along the river, but it is a far poorer version of some of the magnificent spots nearby like Vienna, Prague and Budapest, or other “cute old towns” such as Ljubljana or Krakov
My suggestion is to allocate the time you have to those cities rather than making the trip to Bratislava
Then again, if you’re on a stag do / bachelor party, I could see the appeal as it looks well set up for this. A few drinks in the square, boat party and then on the lash, happy days. Less so for anything else
Extra tip – watch out for the taxi drivers charging high prices, especially from the station or airport. They’ll tell you it’s a minimum charge of €20 / €40, which is nonsense. Should be less than €10 from the station and and around €20 from the airport