Mare Nostrum proved to be quite lovely for our anniversary getaway. The bottom floor is very much wide open with each of the three rooms connected to one another via wide openings. It was really quite comfortable for my wife and I. One funny thing that I failed to notice in the pictures was that the steps to the second story are located outside, there is no connection to the upstairs inside the house. Not an issue for us during our stay, but if you had inclement weather to contend with it might prove problematic.
We really enjoyed the decorating throughout the house. We also appreciated some of the smaller things, like the silverware that is provided is clearly an antique set of silverware. Not a huge thing, but it feels better in your hand rather than something from Ikea. There were thoughtful little things like that throughout the house that enhanced our time there.
The walk to the beach is probably 7 or 8 mins. There is a walkover on the east side of the development that was quite convenient. But you could also easily walk down Beach Access Road 1 as well to get to the beach- it is about the same distance away as the walkover. I would not want to deal with the walk if I had kids, but maybe your kids are up for something like that more so than mine would be. There is quite a bit of construction happening around the development, so a good amount of construction noise in the distance- but nothing super close to the house itself.
The check-in process was quite easy and all communication was conducted via email prior to our arrival. We didn't have any issues during our stay so there was no need to contact the property manager while we were there, but I would imagine they would have been quite prompt in their reply.
We really enjoyed our time at Mare Nostrum, and would definitely consider booking it again in the future!