You first 5 pictures are the first impression to a prospective guest. 4 of your first 5 are of the same room. So it doesn't show them much.
Try mixing in some of the other photos so people get a better feel of your property. Maybe a view from a window or a picture of the building from outside. As you mention it is close to the Parliament add a picture of that and any other things that stand out. Maybe a spa, ruin bar or park.
I might be tempted to add some more description of the place in the about the space section.
From memory of Budapest the location is perfect so try to make a bit more of that. I know it is tempting me when I next go to Budapest.