This is great place, if you know what you are getting into.
First of, pluses: host professionalism is top notch: check in, check out, general availability and helpfulness is just perfect. The location is great, with ease to get in and out right to the Trafalgar square. Apartment and building are clean, bed sheets are soft (blanket might be a bit too warm, but it worked for us), both apartment and room are tastefully decorated, kitchen has all the convenient utensils and appliances (tea and coffee facilities are not in your room, but in the kitchen, and coffee maker is for capsules only, we brought our own aeropress). Bathroom is spacious, nicely finished, relatively modern, it lacks electric outlets, but we managed. There is only one other bedroom in the apartment, along with host's office, and shared kitchen and bathroom, so we felt pretty private in our room (we had the key for the room as well as set of keys for the building and the apartment).
Two issues that bothered us are really just side effect of living in an old building in central non-residential neighborhood: street noise, and hot water supply.
That "Rubbish collection outside during the night" is not a joke. It sounds as if garbage truck right outside our window collects bags with bottles and then crushes them for about 10 minutes (apartment is on the second floor). Weirdly, that seem to be happening several times during the night: like at 2AM, and then again at 5AM. That took several nights to get used to.
Another issue is hot water supply. There is a boiler in the room, so you have to wait a little bit for hot water, and then adjust it right as it can get burning hot, and just hope that there will be enough hot water for one shower. More than once, there was not enough for us. Better be ready to practice contrast showers. It was not something that would spoil our stay though, just one of those local specialties.
If these drawbacks don't bother you, then this is just perfect room to stay in London. It was for us, we stayed 9 nights and been very happy here.