Most recordings of pianos make use of one or more stereo pairs of condenser microphones – anything from a pair of large diaphragm Neumanns, through to Aston Spirit microphones, to a simple pair of small diaphragm condensers. Whilst Condenser microphones are typically used, you could get great results from something like a Shure SM58. Microphone placement and polar pattern will depend on the particular piano, the room and whatever sounds best!
For the Winter Piano a pair of Neuman M149 were used, placed in a 3:1 ratio, where the microphones are placed 3 times as far apart as they are from the sound source. This helps with phase issues (which are more likely if the two microphones are pointing at the same point).