This is a beautiful apartment and we (two adults and a pre teen) were very comfortable here. I can't comment on the air conditioning but in an unseasonably cold Easter break, the heating worked a treat!
Everything you need is in there and everything works a treat. There were lots of thoughtful little touches like dishwasher tablets, seasonings and even clingfilm The little things that you miss on a break when you just need a small amount of something you'd readily have at home. If anything was missing (we couldn't find a chopping board) it felt very much that it was because no one had mentioned it before than it had been judged unrequired. The provision of comforts felt generous.
The apartment is a little way from town so you have to either walk in or take a taxi (circa €10). There are pros and cons to this. We felt slightly away from the centre but slept like logs in our quiet shuttered sanctuary. The marina is close by and we had several lovely meals there. The restaurants in general in Sitges were very good.
The lock on the door is a bit sticky and takes a bit of wiggling and yes, you can hear the trains but from all the reviews on the site, that can't come as a surprise to anyone.
Overall, this is a great apartment with great facilities and everything was of the highest standard. The views were spectacular. We had a few days of sunshine and stunning blue seas and even when the weather was bad and the sea was stormy, it was still nothing short of spectacular.
The communication leading up to the holiday was great and while we were there Ramon was really helpful and went above and beyond to ensure we had a great time.
Nothing to criticise, everything to recommend it and we'd love to go back.
Highlights for us in Sitges - restaurants generally, Queenz dinner show, Segway tour and our daughter did motorbike riding at Eco Moto Extreme who were ultra safety conscious and she had a brilliant experience.