We just got back from the Bouganville last night, we've been to this hotel for the past 6-7 years. You've chosen a really great hotel, the location, food and staff are all fantastic.
We had a room facing the mountains and towards PDLA, and it didn't get any sun during the day/early evening, but that didn't detract from our stay, the room certainly wasn't cold or gloomy, and the views over the mountains are, I think, are quite spectacular. It is especially nice at night to see all the shops/bars/hotels lit up and looks lovely. Because the weather was so hot I think a room in the sun would have been too much for us - the air conditioning seemed ineffectual.
Whilst we were there we saw several men and women travelling alone, and this is something I would feel comfortable doing as the people/staff at the hotel are very friendly.
The only downside for me this time was how busy the hotel was, we struggled some days to find a table at breakfast and dinner. It seemed much busier this year than previously. The pool side was also very busy around both pools, although we did always manage to find 2 sun loungers. I'm not sure if this is because the hotel is now AI?
The rooms, as people have commented, do need refurbishing - some of them quite badly. Our bathroom this time wasn't particularly nice, the sink was cracked and the bath had seen much better days. The towel's are also ready for renewal and some days ours were quite thin.
The food, as usual was excellent and couldn't, in my opinion, be faulted.
There are lots of nice bars by the hotel, and in the surrounding vicinity.
Have a great time, any questions just ask!