@Petra-Ilona0
You have a lovely unit!
And I agree with everything @Linda108 had said.
I could add that you might want to give your listing space a bit more personality by adding some special art work. (Not the framed records)... Maybe some colorful and/or traditional CZ glass. Possibly some coffee table books about Prague...
I love old travel posters... And framed old maps of the area.
And by all means, you MUST specify the bar seen. And be transparent, call them 'bars'... If the bars and clubs are open all night, you need full disclosure. Don't skirt around it by calling the area 'vibrant' if it's a true party seen!
If it's a REAL problem, provide noise canceling headphones, or at least a big bowl of individually packaged ear plugs.
Sounds like your property is very noisy... This would be an issue for me and I don't think it would be as attractive to families with children.
If this were my property, I would reduce the number of guests to 4. Don't try and fit more people into a small space. You won't make any more money... Six guests will trash a place faster than anything! And I would raise your rates...
Another thing of note: Percale sheets means Cotton not Linnen. Both are great, but if it's not 100%, I wouldn't have it as an amenity on your listing.
I would also buy a new couch... Something very comfortable, and NOT for sleeping on! You might spend a bit up front... But your space needs more seating in the living room. Maybe 2 more chairs...
Again, if your location is good and your listing is unique, you can charge more than the competition.
Get an artsy friend to help with adding elements to the decor... You don't want your listing to look like a hotel, or an Ikea advertisement... You can brighten up your windows by having quality drapes and maybe some throw cushions with local textiles...
Finally, don't forget a bottle of wine in the fridge, with a few munchies goes a long way in getting these five star reviews.
Oh yes, please add more photos of the exterior of the property... Street views, etc....