We unfortunately had to cut our stay here short.

At 6am on the morning of New Years Day we were awoken by the sound of an alarm, on further investigation we found that it was actually the carbon monoxide alarm in the kitchen that was sounding.
With this in mind (and to be honest in a bit of a panic) we turned off the boiler and opened all the windows in the kitchen and the main room, after which the alarm then stopped.
Whilst opening the windows, we noticed that there were a few windows both in the kitchen and the main room that were forced, and jammed open, so we were unable to actually close them, which we thought was very strange considering the time of year!

A couple of hours later, the plumber arrived to check the boiler. He spent around 5 minutes having a look at the boiler, and told us that he was going to suggest to Doreen that she got a new carbon monoxide alarm. He then switched everything back on.
We were then waiting for the apartment to heat up, which didn't happen, with the windows jammed open, and the radiators in the front room turned off, I'm not surprised it didn't warm up!

After spending the majority of New Years Day on the sofa / in beds in duvets, and not being able to have a shower we decided to leave a day early.

After we left the apartment, we called and left Doreen a voicemail to let her know we had left. In return I received a voicemail back from Doreen, which was in no uncertain terms rude, and verging on slightly aggressive.
When I eventually spoke to Doreen she said we were "silly to assume that it was the carbon monoxide alarm that was going off!!"

We have since asked Doreen for a copy of the plumbers report (which the plumber informed us he was writing up for her), to more than anything put our minds at ease that our health and safety was not in danger at any point during our stay.
Doreen has refused to provide this to us, stating that the cost of the report would be "our responsibility" should we wish to view it.

We were not impressed with what happened during our stay at the apartment, and more so since we have left, we certainly have not been impressed with Doreen's attitude towards the issue.

It's a shame this has happened, as it is a nice apartment, but unfortunately the experience has left a very bad taste and certainly would not return.