I have added an old Steinbruck & Söhne piano to my Collection.

Hey, i have bought an old concert Upright by Steinbruck & Söhne and im a bit concerned becuáuse this is my first 100+ year old Piano. I love the sound and already bought it for 700€. Anything special to look out for? It plays nice (It is quite heavy to push the keys) and im looking forward to play it, but what are usual costs and maintanance that will come at me?