I stayed at Alex's duplex with some friends for a four night birthday trip and we absolutely enjoyed our time there. Over the course of the four nights we had between three and six people staying at the duplex. The duplex is quite spacious and even with six adults staying and sleeping there we never felt like we were on top of each other. The common spaces were large enough to accommodate everyone and we were comfortable either hanging out in the kitchen or lounging in the living room. The deck and back patio are also nice chill out spaces. The sleeping arrangements were adequate, but we're all close friends so we didn't mind crashing with each other when all six of us were there. The futon is actually really comfortable as well.
When I was looking for places to stay I was originally looking for something more to the south of Andersonville and closer to Wrigley, as my group was going to a bunch of baseball games and seeing sights downtown. However, we ended up absolutely loving the area and the nearby neighborhoods that we probably wouldn't have experienced, otherwise. It's not a super busy or party kind of neighborhood but it's authentic and it didn't seem to be packed with tourists (just us!) The nearby beach is pleasant and a quick 10 minute or so walk away. The L station on the Red line is just two blocks away and there are some shops in a addition to a play house on the walk to the station. The duplex is also not far from the Chicago Lake Front Trail which is great for jogging and bike riding.
I would however point out a couple of small things, one being that for six people we could've used more towels in the bathrooms (we liked the bathrooms) even though there is a washing machine and dryer in the basement if you need to wash towels. Additionally the ceilings in the finished basement are pretty low. I'm 6 feet tall and I was pretty close to the ceiling in some spots. We had a couple of taller guys and it wasn't a big deal but just something to be aware of. I'm nitpicking, to be honest.
Overall, my friends and I were extremely happy with our stay at Alex's place and felt that it enhanced our time in Chicago. Alex was a breeze to communicate with and was an excellent host.