Flat share or whole flat

Hello everybody!

I'm a pianist, former student of the Moscow Conservatory, and plan to revisit the city for a three-month stay.
I'm looking for a short-term rental for that period (share or whole flat), preferably central.
My dates are flexible, and my trip would take place only when the right housing solution shows up.
If there is a piano in the flat that I can use for 3-4 hours a day, it'd be ideal.
I'm also happy to rent a room in a shared flat, where I don't bother anyone, and where I am not bothered.
I'm a very quiet young man, well travelled, good listener. I know  Moscow quite well and speak the language fluently. Fortunately I don't need a visa for Russia - as long as I stay no longer than 90 days-, and this certainly makes things easier.
Does someone have tips and suggestions for me? I'd be grateful.
Thanks for contacting me.