We had a really nice time during our stay in London. The room was very modern (decked out in Ikea I believe) and looks exactly as it does in the photos. There's plenty of utensils, cookware and dishes for two people to enjoy cooked meals on the collapsible pullout table before heading out into the city. Alessandro also left small cereals, jams, other assorted snacks and even a welcome bottle of wine for us in the extremely clean apartment. The bed fits two people well without feeling crowded.
The bathroom (also very clean) is literally around the corner, with a toilet and (small) shower for use. There is an additional toilet right across from the room if someone is occupying the main bath (which is a possibility given the bathroom is shared with another unit; this was a problem we never encountered though).
There are only two things of which to be aware. The first is that this condo is at the very top of complex. As there are no elevators, you'll be climbing up and down 82 steps to reach the 8th floor. If you have big heavy suitcases, you'll probably have an interesting time initially entering and when you leave. The second thing is that if you bring more than two or three standard size suitcases and lay them out on the condo floor, you'll be left with little floor plan to walk around. Obviously you avoid this by closing them up and setting them in a corner but something to be aware of. Since you're mostly out and about exploring this should also not really be an issue.
Speaking of, the location is fantastic given how close it is to the underground (Pimlico and Victoria stations are five minute walks away) to the general sites around the city. We walked around for a lot of our stay and never felt too exhausted to walk back to the condo.
Overall very enjoyable stay.