Markeyz

A piano should preferably be placed near an interior wall to minimize temperature fluctuations if it is going to be against a wall at all. Also, put it where it won't be in direct sunlight, or keep shades down when the sun would be shining on it. In addition to everything Cydonia mentioned, there is the issue of setting the tuning pins which basically means tuning each string slightly sharp and then backing it off so that it is perfectly in tune. This is a skill that takes practice to master. I tune my Rhodes electric piano all the time but call a pro for the acoustic since it is orders of magnitude more difficult. You will also need a technician to do occasional action regulation to keep the keys feeling even and voicing to keep the hammers a consistent hardness and the tone even.