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The minimum load bearing capacity of any floor for a studio must be at least of 1t/m² static load. You must add about 200kg/m² of dynamic load capacity for a studio in normal use.
If the building is old, this is reduced by 200kg/m² down to 800kg/m². You must also be careful to ask the structural engineer to look if the building wasn't overloaded at one point, which may imply that you cannot load it as much as expected on some spots and must redirect some load on specific points.
It sounds like you will need to decouple your studio too (or you will hear everything on the ground floor and render it unusable, no matter how much insulation you use), which means that on the perimeter of your rooms, the structure needs to stand weights of over 1,5t/m². Decoupling takes a lot of materials and weight.
I wouldn't put it on the 1st floor for technical reasons (a lot of extra things to calculate and implement) and cost reasons: expect it to be very expensive if you want serious soundproofing (extra work load for engineers, acousticians, more materials...)
YMMV
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