I wrote a more in-depth review of Jimmy's place a few days ago, when I stayed in Room 1. I'll add here a quick contrast here of Rooms 1 and 3 (N.B., Jimmy rents out three bedrooms in this 3-bedroom flat on the second floor of the house. Kitchen and full bathroom are shared, and there is a second toilet for when the main bathroom is occupied).
If I can add anything of note to my earlier review, it would be what I see are the pros and cons of Room 1 vs. Rooms 2 and 3. The former, Room 1, is at the front of the house, separated from the other two bedrooms by the main entrance, kitchen, and bathrooms. In this sense, Room 1 has more privacy/separation in that it shares no walls with the other two bedrooms. Then again, the walls are solid and quite soundproof, so noise between rooms isn't an issue anyway. Nevertheless, there is that additional separation, which is nice IMO.
On the flip side, Room 1 faces the street, so there is a bit more noise from the exterior, especially with the window open (which frankly is one of the best parts of SF - the weather). That said, it's hardly noisy; it's a residential street through and through. The occasional truck will roll on through and neighbors are often out and about walking their dogs, etc., but nothing intrusive. Still, you are somewhat shielded from that type of noise when staying in Room 2 or 3. Then again, there are many adjacent houses, so even with Rooms 2 and 3, there is some ambient noise outside when you have the windows open, though via the facing back yards as opposed to the street. Again, common neighborly noise, in no way intrusive.
So, what does this mean? I don't know. I think overall I would choose Room 1 over either of the other two rooms if given the option, simply because I'm a raging introvert and will always take privacy over most anything else when given the choice. But Rooms 2 and 3 are both excellent rooms as well, and I wouldn't hesitate renting either. And lord bless the carpet in the house. Oh my...