Pluma makes some good points. I just want to add a few more.
Adding IT to the domain name will not necessarily help with search performance. It will not sink into the SERPs as a search term, partly because
it is a word, and
IT is overly used. The keyword waters surrounding IT is murky at best.
Having said that, the domain name should be memorable and simple. It should become a
top of mind (marketing speak) domain name even if they only hear/read it once (hopefully).
I think that adding
it at the end will actually confuse the readers of the domain name. For example sillywillyit.com, billybobsit.com, chigacoit.com, etc. Okay some of these are silly and just for fun, but as you read these domain names, adding the
it at the end makes it harder to read and absorb. I thought of a few that I had to refrain from typing. It is amazing how adding
it to the end of a domain name can really skew the intent.
Selecting another TLD other than .com, .net, and .org can limit your reach in search engines considering that TLDs have a reach based upon performance. All TLDs experience this, however, the three main and original TLDs experience greater impressions and presence in search. If you are selling in the U.S. for example, selecting a .uk ccTLD will severely limit who sees your site even if you are a UK company.
I suggest thinking on possible domain names a bit harder and longer. I am sure you will find one you like better that will fit the bill just fine. It will come to you at an odd time so carry a pen and some paper with you! But for the smallest room in the house, you may only need the pen. [insert laugh track here or crickets] It seems that is the way. That is where I do my best thinking!