I would like to mention two points
1. I communicated with the property manager through both Expedia and private emails. As I will touch down in Heathrow at around 0615, I expect to reach the property at around 0900. I asked if I could have an early check in if there's no one staying the day before but it wasn't properly replied. I was given the standard phrasing like 'you may leave your luggage after 1130 when the cleaning lady is in and actual check in should be 1500 onwards'. When the property owner emailed me saying that a potential buyer will be viewing the property on 19 Mar 1600 and asked if I allowed them in, I replied that I do not mind but do ensure that my stuff are well taken care of. As I am not oblige to let them in, I wanted to strike the early check in deal again but this was entirely ignored and the property manager gave me a standard reply as before.
2. On the day of arrival, I texted the property manager (they mentioned on their check in sheet that I could text them) but again there was no reply. I have to wait at a Cafe in Euston station for close to 2 hours. After I went up, the cleaning lady was there and I left my baggage in the apartment. At night, when I returned, and as I am not used to UK door system, I am not able to open the front door. I quickly texted and made a call to the property manager but again there's not reply. The following morning, I saw from WhatsApp that my have been read (blue-ticked) but they didn't bother to reply me.