Hi
I bought in Puerto de Mazarron early last year, which is about 20 mins from Condado on the coast. It's a great location with many activities around, especially in the summer months, many bars, restaurants etc. The area gets very busy in the summer and quiet in the winter so it's nice to have the contrast. I'm actually just in the process of buying another property in the area to rent out for holiday rentals. I don't usually comment on posts but I was searching a street name near by and your post came up on google.
I used Blue Med Invest for both purchases and they've been great. Everything was above board and legitimate, which was my main concern when I first bought after reading people's horror stories online. They have exclusive deals with some developers so a lot of new builds are only available with them. I've personally dealt with Nynke and Julio myself who have been generally great and informative. They do free inspection trips where they put you up in a hotel and refund your flight costs if you end up purchasing with them.
In my own opinion, Puerto de Mazarron is a better long term investment than Condado. Being on the coast and in a long established town, property is more likely to have hold its value or increase over the years. This does come with a slightly higher price tag for property in the area but in the new builds available the spec is high and the design more modern. If you google Bluemed invest their website comes up and their Rightmove page. If you were looking to rent out your new property, from the research I've done you can command roughly 3x the price of a 3 bed rental in Puerto de Mazarron compared to Condado or other inland developments. I have visited Condado a few times when in Spain and it is a great development however if that is the location you prefer.
Just one thing to point out, whatever timescale for completion they give you add a couple of months on. The typical Spanish 'mañana' attitude is very commmon with solicitors, notaries, government departments and banks. It can be frustrating for us brits who want everything done yesterday but just run with it, apply a little pressure and try not to stress too much. I tend to now accept that that's the culture so it's me that needs to adapt!!
Also, as a heads up always negotiate on price. The agents will try and insist that the price is fixed and the developers won't move on price, even to the point where they end the conversation (probably assuming you'll come back and agree the night price). Stick to you guns and don't give up. I've just knocked 20,000€ off a 225k property. It took 4 days of haggling but worth it in the end.
Hope that helps.