My family of 6 adults stayed at the Lille Apartment in May. It is clearly noted on other folks comments that there are lots of steep stairs to this apartment (approx 35). This was not a problem for our family. The apartment was advertised as refurbished. I have to slightly disagree with this comment. The kitchen, living/dining & bedroom areas definitely appeared new & well cared for. The bathroom toilet & sinks also appeared new but there was a clear problem with all 3 showers. They had orange stains on the lower tiles & in the corners- mold, hard water, dirt or just old? I don't know but it certainly did not give the appearance of being refurbished.
The check in process (we did independently on a weekend) was straight forward but one must be able to sit on the ground in a small area to retrieve the key. For security purposes, I will not say anything further but our family members in their 20's had to sit to get the key. The walk to the 2 nearby train stations was very pleasant and safe.
The apartment had 2 thin pillows on each of the beds and 2 of my family members needed to 2 pillows to sleep at might. The next day on a Sunday the pillows were present when we arrived back to the apartment. Prior to and once while we were in the apartment, Alessandra was super prompt in replying to emails.
London is a great city to visit & we had a lovely time!