Burton's place was great and exactly as advertised. A private bedroom and half bath with great sunlight in the mornings and throughout the day. There was enough room for me to work out in the bedroom (there's a pull-up bar!) and I was able to comfortably work from home for my entire two-week stay. The internet speed was fast, which is important because I work as a software engineer. You'll want to make sure to connect to the network that has "-5G" at the end of the name.
Burton himself is a great guy with plenty of interesting conversation and NYC suggestions. His dog Picasso is very friendly and talkative :). Sharing the shower was not a problem: throughout the two weeks, I never had to wait to take a shower, and it was all a very pleasant experience.
I would note that I tended to eat out, though there was some room for me to keep food in the fridge. I made coffee & breakfast in the morning and kept food for lunch in the fridge, but was most comfortable eating dinner out most nights (there's chipotle and other options less than a block away).
If you're traveling by yourself and want a great location in Manhattan and a great host, defintely stay at Burt's! I plan to stay again if I'm able :)