I think you'll love the location of David's basement apartment. It's within walking distance of restaurants, a park and a grocery store. We didn't end up walking anywhere because it was so chilly when we stayed here, but if you stayed in the summer you'd have a lot of options close by.
Parking was easy to come by on the street. No issues there.
The apartment is really well appointed. It has everything you need and then some. For example, my husband and I were a bit chilly the first night after a hike we did, and we found a small space heater in the closet and a couple of blankets. It was a nice surprise.
It's a cozy space that's perfect for two people. The bedroom is tight - not much space to move around the bed - but that didn't bother us. The kitchen has a whole selection of pots, pans, plates, knives - you could move in and stay a while.
The only mild inconvenience was the noise. One of the three nights we stayed there, there was somebody in the other basement apartment. We could hear what they were saying through the walls (and they were not being loud or boisterous). I had to put earbuds in with white noise to get to sleep. Be prepared for if/when that happens. It wasn't a deal breaker for me and not surprising since it's an older house, so I'd definitely come back.
Checkout was easy. Everything was easy. Thanks for your hospitality, David! I'll try to book you again next time we're in Denver.