My girlfriend and I only stayed for one night, but we very much enjoyed staying in Nima's guest house. It was private and provided a plethora of amenities, like a personal bathroom (with shower) and kitchen. The kitchen was very well-stocked; it featured two modern electric stovetops, a microwave, a mini fridge, a sink, and a plethora of dishes and cookware. The only thing I noticed missing was a sponge for washing dishes.
The decor is very hipster - which aligns with my taste - but not everyone will enjoy the industrial lighting and cracked floors.
I appreciated Nima's attention to detail. My girlfriend and I have very different taste in pillows and the bed came with pillows of varying soft/firmness. He left us some beers in the fridge and even delivered us a space heater in the night (which was perfect as the house isn't well-insulated).
Overall, Nima's place was a very good value. It came with many perks and, if you're into the style, it's very cozy. The lack of sponge was an inconvenience, but my main complain would be the low-ply toilet paper.