Recommend a carpet company to cover stairs?

Hi, we have a 14-month old and have decided it is time to cover our lovely wooden staircase and landing with a thick carpet that will be safer for us and for our baby when she does start climbing the stairs.  Can anyone recommend a vendor/company that has done a good job with what seems like a more complex carpeting task?  Any recommendations about carpets that are less toxic are welcome too - as I recall there is a very strong smell associated with new carpets.

Thanks in advance for any advice!