My family, including elderly parents, visited me in London and the place had stellar reviews with pictures that looked indeed great. However, my experience was absolutely not as expected given:
1) Check-in was not prepared. Two codes are needed to first enter the building and then the apartment. We didn't receive the apartment code (only 'XXXX*') and the code to enter the apartment was incorrect)
2) Corridor lights did not work of the apartment
3) Massive smell of mould in the bedrooms located in the basement
While 1 and 2 can happen, 3 is totally unacceptable. The smell was so strong that I was seriously concerned about my family's health when breathing this in while sleeping. We immediately contacted the hosts about this issue who tried to organise a replacement for us. However, thanks to friends who also live in London, we had found a different arrangement by then already and didn't take them up on their replacement offer anymore. I acknowledge that their replacement was supposed to be an upgrade., but it was a little further out than we had planned to stay and it already became really late so we didn't feel like trying the next place, especially because of the very bad experience the first time around.
The fact that they tried to offer a replacement is the reason that I provide 2 stars instead of just one. However, I find it totally unacceptable to offer a place that has such a bad smell of mould in an apartment, especially in bedrooms. It meant a great deal of issues on my side to host my family, including elderly parents, who visited me in London.